Audio-Technica Wireless Headphones ATH-CK3TW User Manual

User Manual

Wireless Headphones

    ATH-CK3TW

Introduction

Thank you for purchasing this Audio-Technica product.
Before using the product, please read through the Quick Start Guide and Caution Guide, as well as this user manual when
necessary, to ensure that you use the product correctly

Safety precautions

Although this product was designed to be used safely, failing to use it correctly may result in an accident. To ensure safety,
observe all warnings and cautions while using the product.

Cautions for the headphones

• Do not use the product near medical equipment. Radio
  waves may affect cardiac pacemakers and medical electronic
  equipment. Do not use the product inside medical facilities.

• When using the product in aircraft, follow airline instructions.

• Do not use the product near automatic control devices such
  as automatic doors and fire alarms. Radio waves may affect
  electronic equipment and cause accidents due to malfunction.

• Do not disassemble, modify or attempt to repair the product to
  avoid electric shock, malfunction or fire.

• Do not subject the product to strong impact to avoid electric
  shock, malfunction or fire.

• Do not handle the product with wet hands to avoid electric
  shock or injury.

• Disconnect the product from a device if the product begins to
  malfunction, producing smoke, odor, heat, unwanted noise or
  showing other signs of damage. In such a case, contact your
  local Audio-Technica dealer.

• Do not allow the product to get wet to avoid electric shock or
  malfunction.

• Do not put foreign matter such as combustible materials, metal,
  or liquid in the product.

• Do not cover the product with a cloth to avoid fire or injury by
  overheating.

• Follow applicable laws regarding mobile phone and headphone
  use if using headphones while driving.

• Do not use the product in places where the inability to hear
  ambient sound presents a serious risk (such as at railroad
  crossings, train stations, and construction sites).

• The product effectively shields external sound, so you may not
  hear sound around you clearly while wearing the product. Adjust
  the volume to a level where you can still hear background sound
  and monitor the area around you while listening to music.

• Store the product out of the reach of small children.

• To prevent damage to your hearing, do not raise the volume too
  high. Listening to loud sound for an extended period may cause
  temporary or permanent hearing loss.

• Discontinue use if skin irritation results from direct contact with
  the product.

• If you begin to feel unwell while using the product, discontinue
  use immediately.

• When removing the product from your ears, check to make
  sure the eartips are still attached to the main unit. If the eartips
  become lodged in your ears and you are unable to remove
  them, consult a physician at once.

• If you develop an itch from wearing the product, discontinue use.

Safety precautions

Cautions for charging case

• Do not disassemble, modify or attempt to repair the product to
  avoid electric shock, malfunction or fire.

• Do not subject the product to strong impact to avoid electric
  shock, malfunction or fire.

• Do not handle the product with wet hands to avoid electric
  shock or injury.

• Disconnect the product from a device if the product begins to
  malfunction, producing smoke, odor, heat, unwanted noise or
  showing other signs of damage.
  In such a case, contact your local Audio-Technica dealer.

• Do not allow the product to get wet to avoid electric shock or
  malfunction.

• Do not put foreign matter such as combustible materials, metal,
  or liquid in the product.

• Do not cover the product with a cloth to avoid fire or injury by
  overheating.

• When charging, make sure to use the included USB charging cable.

• Do not charge with devices that have quick-charge functionality
  (with a voltage of 5 V or more). Doing so may cause the
  product to malfunction.

• Do not store the product in direct sunlight, near heating
  devices, or in hot, humid, or dusty places because such storage
  could cause malfunction or defect.

• Do not put it close to fire because that could cause deformation
  or malfunction.

• Do not use benzine, paint thinners and electrical contact
  cleaner, etc. because use of such material could cause
  deformation or malfunction.

Cautions for rechargeable battery

The headphones are equipped with a rechargeable battery (lithium polymer battery). The charging case is equipped with a rechargeable battery (lithium- ion battery).

• If battery fluid gets into eyes, do not rub them. Rinse thoroughly with
  clean water such as tap water and consult a doctor immediately.

• If battery fluid leaks, do not touch fluid with bare hands. If fluid
  remains inside the product, it may cause malfunction. If battery
  fluid leaks, contact your local Audio-Technica dealer.
  –– If fluid gets in your mouth, gargle thoroughly with clean water
  such as tap water and consult a doctor immediately.
  –– If your skin or clothing comes in contact with fluid,
  immediately wash the affected skin or clothing with water. If
  you experience skin irritation, consult a doctor.

• To avoid leakage, generation of heat or explosion:
  ––Never heat, disassemble or modify the battery, nor dispose of
  it in a fire.
  ––Do not attempt to pierce with a nail, hit with a hammer or
  step on the battery.
  ––Do not drop the product or subject it to strong impact.
  ––Do not get the battery wet.

• Do not use, leave or store the battery in the following places:
  ––Area exposed to direct sunlight or high temperatures and
  humidity
  –– Inside of a car under the blazing sun
  ––Near heat sources such as heat registers

• Charge only with the included USB cable to avoid malfunction
  or fire.

• The internal rechargeable battery of this product cannot be
  replaced by the user. The battery may have reached the end of
  its service life if the usage time becomes significantly shorter
  even after the battery has been fully charged. If this is the case,
  the battery needs to be repaired. Contact your local
  Audio‑Technica dealer for repair details.

• When the product is disposed of, the built-in rechargeable battery
  needs to be discarded properly. Contact your local Audio-Technica
  dealer to learn how to properly dispose of the battery.

For customers in the USA
FCC Notice
Warning

This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1)
This device may not cause harmful interference, and (2) this
device must accept any interference received, including
interference that may cause undesired operation.

Caution
You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority
to operate this equipment.

Note: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a
residential installation. This equipment generates, uses
and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause
harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more
of the following measures:
––Reorient or relocate the receiving antenna.
–– Increase the separation between the equipment and receiver.
––Connect the equipment to an outlet on a circuit different from
that to which the receiver is connected.
–– Consult the dealer or an experienced radio/TV technician for help.

RF Exposure Statement
This transmitter must not be co-located or operated in
conjunction with any other antenna or transmitter used in
other systems. This device complies with FCC radiation
exposure limits set forth for an uncontrolled environment and
meets the FCC radio frequency (RF) Exposure Guidelines. This
equipment has very low levels of RF energy that is deemed to
comply without testing of specific absorption rate (SAR).

For customers in Canada
IC statement

CAN ICES-3 (B)/NMB-3(B)
This device complies with Industry Canada’s licence-exempt
RSSs. Operation is subject to the following two conditions:
(1) This device may not cause interference; and (2) This
device must accept any interference, including interference
that may cause undesired operation of the device.
Under Industry Canada regulations, this radio transmitter
may only operate using an antenna of a type and maximum
(or lesser) gain approved for the transmitter by Industry
Canada. To reduce potential radio interference to other users,
the antenna type and its gain should be so chosen that the
equivalent isotropically radiated power (e.i.r.p.) is not more
than that necessary for successful communication.
This device complies with RSS-102 radiation exposure limits
set forth for an uncontrolled environment.

Notes on use

• Be sure to read the connected device’s user manual before use.

• Audio-Technica will not be liable in any way for any loss of data
  in the unlikely event that such losses should occur while using
  the product.

• On public transportation or in other public places, keep the
  volume low so as not to disturb other people.

• Minimize the volume on your device before reproducing music.

• When using the product in a dry environment, you may feel a
  tingling sensation in your ears. This is caused by static electricity
  accumulated on your body, not by product malfunction.

• Do not subject the product to strong impact.

• Do not store the product in direct sunlight, near heating
  devices, or in hot, humid, or dusty places.

• When the product is used for a long time, the product may
  become discolored due to ultraviolet light (especially direct
  sunlight) and wear.

• If the charging case is placed in a bag while the USB charging
  cable is still connected, the USB charging cable may become
  caught, severed, or broken.

• Make sure to hold the plug when connecting and disconnecting
  the USB charging cable. The USB charging cable may become
  severed or an accident may occur if you pull on the cable itself.

• When you are not using the USB charging cable, disconnect it
  from the charging case.

• When you are not using the product, store it in the included
  charging case.

• If you use eartips other than those included, the headphones
  may not fit into the charging case, or may not charge. Be sure
  to use the included eartips.

• When using the product, select the eartips that fits your ears
  best, and wear the product securely.

• This product can be used to talk on the phone only when using
  a mobile telephone network. Support for telephony apps that
  use a mobile data network is not guaranteed.

• If you use the product near an electronic device or transmitter (such
  as a mobile phone), unwanted noise may be heard. In this case,
  move the product away from the electronic device or transmitter.

• If you use the product near a TV or radio antenna, noise may be
  seen or heard in the television or radio signal. In this case, move
  the product away from the TV or radio antenna.

• To protect the built-in rechargeable battery, charge it at least
  once every 6 months. If too much time passes between
  charges, the life of the rechargeable battery may be reduced, or
  the rechargeable battery may no longer be able to be charged.

• Charge the product in a well-ventilated place (10 to 35 °C) away
  from direct sunlight. Otherwise, the battery may deteriorate,
  possibly resulting in shorter periods of continuous use or may
  fail to charge.

• Operate the touch sensor with one finger. Operating with a
  sharp-tipped object, such as a ballpoint pen or pencil, may
  result not only in incorrect operation, but also damage to the
  touch sensor.

• Do not touch the touch sensor with your fingertips. Doing so
  may cause your fingernail to break.

• If the product does not operate at all or as intended when
  touched, check to make sure that your other fingers, parts of
  your hand, or clothing items are not in contact when touching.
  Also, the product may not operate correctly if you are wearing
  gloves or if your fingertips are too dry.

• The product may not operate correctly if the touch sensor is
  dirty from sweat. Remove the dirt before operating the product.

About water-resistant (drip-proof) performance

• The water-resistant (drip-proof) specification of this product applies only to the headphones, not the charging case.

• Although the product has water-resistant (drip-proof) capabilities equivalent to IPX2, the part where the sound comes from is not
  water-resistant (drip-proof).

• The water-resistant (drip-proof) performance is designed to protect the headphones if they get wet from rain, etc. (equivalent to IPX2).
  JIS/IEC protection grade IPX2 means that the headphones are protected against water droplets falling from above at a 15-degree
  angle. The headphones cannot be used in hot and humid places, such as bathrooms.

• The headphones are not waterproof. Submerging them in water may cause damage.

For a more comfortable Bluetooth® communication experience

The effective communication range of this product varies
depending on obstructions and radio wave conditions.
For a more enjoyable experience, please use the product as close as possible to the Bluetooth device. To minimize noise and sound disruptions, avoid placing your body or other obstacles between the product’s antenna (R side) and the Bluetooth device.

Part names and functions

• USB charging cable (30 cm (12”),                        • Eartips* (XS, S, M, L)     USB Type-A / USB Type-CTM)

• At the time of purchase, the M-size eartips are attached to the headphones.

Charging the headphones and charging case

• Fully charge the battery when using for the first time.

• If the rechargeable battery power is running low, the product will play a confirmation tone and voice guidance through
  the headphones, and the indicator lamps of the headphones will flash in red. If a confirmation tone and voice guidance
  are played, charge the battery.

• It takes about 2 hours maximum to fully charge the headphones, about 2.5 hours maximum to fully charge the charging
  case. (This time may vary depending on usage conditions.)

1. Connect the included USB charging cable (USB Type-C side) to the battery jack of the charging case.
   • The included USB charging cable is designed for exclusive use with the product. Do not use any other USB charging cable.
   • When inserting the USB charging cable into the USB port or battery jack, insert it directly (horizontally).

2. Connect the included USB charging cable (USB Type-A side) to the computer to start charging.

3. Place the headphones in the charging case.

Charging the battery

• When charging, the charging indicator lamp lights and flashes as follows (it may take several seconds for the
  indicator lamp to light).
  Flashing in red: Charging
  Lit in red for 12 seconds and then turns off: Charging complete
  Quickly flashing in red: Charging error

4. When charging is complete, disconnect the USB charging cable (USB Type-A side) from the computer.
5. Disconnect the USB charging cable (USB Type-C side) from the battery jack on the charging case

• When charging, make sure to use the included USB charging cable. The product may not charge with cables other
  than the included USB charging cable.

Charging headphones without the charging cable

A rechargeable battery is built into the charging case. If you have charged the charging case, you can charge the headphones
without using the USB charging cable.

• If the rechargeable battery power is running low, the product will play a confirmation tone and voice guidance through
  the headphones, and the indicator lamps of the headphones will flash in red.

1. Place the headphones in the charging case.
   • When charging, the indicator lamps of the headphones light
   as follows (it may take several seconds for the indicator
   lamps to light).
   Lit in white : Charging
   Off : Charging complete
   Flashing in red : Charging error

Connecting via Bluetooth

To connect the product to a Bluetooth device, the product needs to pair (register) with the device.

Pairing a Bluetooth device

• Read the user manual for the Bluetooth device.
• Place the Bluetooth device within 1 m (3.3′) of the product to perform pairing correctly.
• To confirm the progress of the pairing process, wear the product while performing this procedure and listen for the
  confirmation tone and voice guidance

1. Remove the headphones (L (left) and R (right)) from the charging case.
   • The indicator lamps will flash in white.

2. Use your Bluetooth device to begin the pairing process and search for the product. When your Bluetooth device finds the product, “ATH-CK3TW” will be displayed on the device.
   • For information about using your Bluetooth device, refer to the device’s user manual.
   • If you pair again after pairing once, “ATH-CK3TW” or “L_ATH-CK3TW” may be
   displayed. Select either one to pair.

3. Select “ATH-CK3TW” to pair the product and your Bluetooth device.
   • Some devices may ask for a passkey. In this case, enter “0000”. The passkey may
   also be called a passcode, PIN code, PIN number, or password.
   • The product plays a confirmation tone and voice guidance when pairing is
   complete.

Connecting via Bluetooth

About pairing

When connecting a new Bluetooth device, you need to pair it with the product. Once the Bluetooth device and the product
are paired, you do not need to pair them again. The product supports multipairing, in which a connection history is saved.
However, in the following cases you will need to pair again even if the Bluetooth device was paired once:

• If the product is deleted from the Bluetooth device’s connection history.

• If the product is sent out for repair

• When switching to a new Bluetooth device, you may not be able to
  pair because the previously connected Bluetooth device cannot be
  disconnected. In such cases, place the headphones into the charging
  case (with battery level remaining for the case) and long touch (about 4
  seconds) the touch sensor area on the R (right) side. The indicator lamp
  will flash in white. After it flashes in white, long touch (about 2 seconds)
  the touch sensor area on the R (right) side. After the L (left)/R (right)
  indicator lamps light in red, they will turn off and then light in white. If
  you remove the headphones from the charging case in that state, the
  product will switch to the “searching for devices” state and you will be
  able to pair with your desired Bluetooth device.

• Perform the operation above within 30 seconds of placing the headphones
  into the charging case.

About Qualcomm TrueWireless™ Stereo Plus

The product supports Qualcomm TrueWireless™ Stereo Plus, which reduces sound interruption and latency through
independent transmission on each side. This feature requires connection with a Bluetooth device that supports Qualcomm
TrueWireless™ Stereo Plus, such as a smartphone.

Using the product

The product can use Bluetooth wireless technology to connect to your device and play music, receive phone calls, etc.
Use the product for whichever of these purposes suits your needs.
Note that Audio-Technica cannot guarantee the operation of displays, such as the battery level display, or applications via
Bluetooth devices

Power supply ON/OFF

Wearing the product

Insert the side of the product marked “L” (LEFT) into the left ear, and the side marked “R” (RIGHT) into the right ear as shown in the figure.
Adjust the position of the headphones so that they fit in your ears securely

Touch sensor areas

The product has touch sensors. When performing operations, touch using the pad of your finger, not the fingertip.

• Operate the touch sensor with one finger. Operating with a sharp-tipped object, such as a ballpoint pen or pencil, may
  result not only in incorrect operation, but also damage to the touch sensor.

• Do not touch the touch sensor with your fingertips. Doing so may cause your fingernail to break.

• If the product does not operate at all or as intended when touched, check to make sure that your other fingers, parts of
  your hand, or clothing items are not in contact when touching. Also, the product may not operate correctly if you are
  wearing gloves or if your fingertips are too dry.

• The product may not operate correctly if the touch sensor is dirty from sweat. Remove the dirt before operating the
  product.

Listening to music

• To connect for the first time, pair the product and your device via Bluetooth wireless technology. If you have already
  paired the product and your Bluetooth device, turn on the Bluetooth device’s Bluetooth connection before turning on the product.

• Use your Bluetooth device to start playback, referring to the device’s user manual as necessary

Touch sensor area (R (right) side)

  Long touch
(about 2 seconds)|   A speech recognition feature (such as Siri on iOS devices) starts, depending on the
connected device.

Touch sensor area (L (left) side)

• Some controls may not be available for music playback on some smartphones.
  • The volume control of some devices may not work well with the product

Supported codecs

The product supports Qualcomm® aptX™ audio (hereinafter aptX) and SBC codecs. When pairing, either the aptX or SBC
codec is selected automatically depending on the Bluetooth device being connected.

• If a Bluetooth device that supports Qualcomm TrueWireless™ Stereo Plus is connected, aptX is connected automatically.
• At the time of purchase, this product is set to the connection codec that prioritizes sound quality, but the connection
  may be unstable due to sound interruption depending on the usage environment. You may be able to improve the
  connection status by switching the connection codec to SBC.

Turning SBC priority connection mode on or off

Perform this while the product and the Bluetooth device are paired.

1. With the product worn in both ears, long touch (about 10 seconds) the touch sensor area of the R (right) side
   headphone.

• After a confirmation tone is played, the product turns off automatically. The product turns on again and is
  automatically connected to the Bluetooth device.

• If the product is not connected automatically, refer to “Pairing a Bluetooth device” (p.9) and pair again.

• The product is connected with the previously set codec even if the product is turned off and turned on again.
  Perform this operation whenever you want to switch the codec.

• If the product is connected to a Bluetooth device that does not support aptX, this operation will not switch the codec.

Talking on the phone

• If your Bluetooth device supports telephone features, you can use the microphone built into the product to talk on the phone.
• When your Bluetooth device receives a phone call, a ringtone will be heard through the headphones.
• If a call is received while you are listening to music, music playback is paused. When you finish the call, music playback resumes. *

• Depending on your Bluetooth device, music playback may not resume.
  • The phone call controls explained above may not be available on some smartphones.

Ear detection

The product has a built-in sensor.
It can detect when the product is removed from or worn in the ear, and automatically perform operations during music playback and calls.

Turning on the ear detection (off at the time of purchase)

1. Long touch (about 6 seconds) the touch sensor area on the L (left) side headphone while music is paused.

• A confirmation tone and voice guidance are played.
• To turn off this feature again, perform this operation again.
• If the ear detection is on, an ear detection tone is played when the product is put into the ear.

Operations during music playback

When you remove a headphone from your ear, music is paused automatically, and music resumes when you are wearingboth headphones again.

• Begin music playback by touching the touch sensor or using the connected Bluetooth device.
• If you remove one or both headphones, the music will pause. To resume playback, wear both headphones.

• When wearing the product, check that the indicator lamps are flashing (ready to use), and then wear the product
  properly on your ears.

• The ear detection may not work if the product is not worn correctly.

Auto power off function

The product automatically turns off after 5 minutes of not being connected to a device.
Also, if you pause the music and do not wear the product for 30 minutes when the ear detection is on, the product turns off automatically.

Reset function

If the product does not work, or other malfunctions occur, place the headphones
in the charging case while referring to “Charging the battery” (p.7) for information
on inserting the USB charging cable to provide power, and then do a reset.
Disconnecting and then reconnecting the USB charging cable will reset the
product and should resolve any problem you are experiencing. If the problem
persists, contact your local Audio-Technica dealer.
Resetting does not change any of your settings (pairing information, volume
setting, etc.).

Indicator lamps on the headphones

The indicator lamp on each headphone indicates the product’s status, as explained below.

Voice guidance

The headphones play English voice guidance in the following situations.

  Situation

|

  Voice guidance

---|---
 Power is turned on|   Power on
  Power is turned off|   Power off
  Bluetooth is connected|   Bluetooth connected
  Bluetooth is disconnected|   Bluetooth disconnected
  Battery level is low|   Low battery
  Ear detection is turned on|   Ear detection on
  Ear detection is turned off|   Ear detection off
  Music is played|   Play
  Music is paused|   Pause

Cleaning

Get into the habit of regularly cleaning the product to ensure that it will last for a long time. Do not use alcohol, paint thinners, or other solvents for cleaning purposes.

• Wipe any dirt off the headphones and charging case with a dry cloth.

• Immediately wipe off any moisture (such as sweat) that has splashed onto the charging case battery jack, the charging terminals, and operation controls (such as buttons on 
  the headphones). Failure to do so may result in a malfunction due to corrosion.

• Natural oils from the skin are particularly likely to build up on the eartip attachment
  parts (see figure at right). If these areas are not cleaned, the eartips can become detached. Clean them regularly. Do not touch the areas where sound is produced
  as they are delicate. Doing so may result in malfunction.

• If the USB charging cable is dirty, wipe the cable with a dry cloth immediately after use. Failure to clean the cable may cause it to deteriorate and harden over time, resulting in malfunction.

• If the USB terminal of the charging cable is dirty, wipe it off with a dry cloth.

• Clean the eartips by removing them from the headphones and manually cleaning them with a diluted mild detergent.
  After cleaning, wipe dry before using again.

• If the product will not be used for an extended period of time, store it in a well-ventilated place free from high
  temperatures and humidity.

Eartips

Eartip size

The product includes silicone eartips in 4 sizes (XS, S, M, and L). At the time of purchase, the M-size silicone eartips are attached.
To ensure the best sound quality, select the eartip size that is best suited for you, and adjust the eartips inside your ears for a snug fit. It may be difficult to hear bass sounds if the eartips do not fit snugly in your ears.

Replacing the eartips

Remove the old eartip and attach the new eartip by pushing it onto the headphone at an angle (see figure).
Push firmly on the eartip so that the inside of the eartip expands, and push the eartip onto the post as far as it will go.

• Periodically remove and clean the eartips as they become dirty easily. Using dirty eartips may cause the headphones
  themselves to become dirty, resulting in deteriorated sound quality.

• Eartips are consumable parts that degrade through storage and use. If the eartips are loose and easily removed or
  if they appear to have degraded, purchase replacements.

• When reattaching eartips that were previously removed, be sure to check that they are securely attached. Injury or
  illness may occur if the eartips become detached and are left inside the ear.

Troubleshooting

Problem                                 Solution
Power is not supplied.             • Charge the product

Unable to pair.

• Confirm that the Bluetooth device communicates using Ver. 2.1+EDR or higher.

• Confirm that the Bluetooth device communicates using Ver. 2.1+EDR or higher.

• Place the product and the Bluetooth device within 1 m (3.3′) of each other.

• Set the profiles for the Bluetooth device. For procedures on how to set profiles,
  refer to the Bluetooth device’s user manual.

• Remove the pairing information for the Bluetooth device then pair the product
  with this device again.

• Place the headphones in the charging case and close the cover. Then, take the
  headphones out again.

• When switching to a new Bluetooth device, you may not be able to pair because the previously connected Bluetooth device cannot be disconnected. In such
  cases, place the headphones into the charging case (with battery level remaining for the case) and long touch (about 4 seconds) the touch sensor area on the R (right) side. The indicator lamp flashes in white. After it flashes in white, long
  touch (about 2 seconds) the touch sensor area on the R (right) side. After the L (left)/R (right) indicator lamps light in red, they turn off and then light in white. If you remove the headphones from the charging case in that state, the product will switch to the “searching for devices” state and you will be able to pair with your desired Bluetooth device. Perform these operations within 30 seconds of placing the headphones into the charging case.

No sound is heard / Sound is faint.

• Turn on the power of the product and the Bluetooth device.
• Turn up the volume.
• Make sure that this product and Bluetooth device are connected by the A2DP (or audio connection).
• Disable pairing for this product and the Bluetooth device, then pair the product with this device again.
• Move away from obstacles between the product and the Bluetooth device, such as people, metal or walls, and place the product and device closer together.
• Switch the sound output of the Bluetooth device to this product.

L (left) and R (right) are not connected (sound does not come
out from the L (left) side).

• Check if there is no battery level remaining.
• Place the headphones in the charging case and close the cover. Then, take the headphones out again.
• If they are not connecting even after trying the above, the L (left) and R (right) may
  be disconnected. Use the following procedure to connect them manually (this
  procedure can be performed only when the L (left) and R (right) are disconnected).
  –– With the headphones and Bluetooth device disconnected, touch the touch
  sensor areas on both the L and R (left and right) sides twice. The indicator
  lamps on both the L and R (left and right) sides will change to quickly flashing
  in pink, and after a while the indicator lamps on both the L and R (left and
  right) sides will slowly flash in white to indicate that the L (left) and R (right)
  are connected.

Troubleshooting

Problem                               Solution

Sound is distorted / Noise is heard / Sound cuts out.

• Turn down the volume.

• Keep this product away from devices that emit radio waves such as microwaves and wireless routers.

• Keep this product away from TVs, radios, and devices with built-in tuners. These devices can also be affected by the product.

• Turn off the equalizer settings of the Bluetooth device.

• Remove obstacles between the product and the Bluetooth device and place them closer together. For details, please refer to “For a more comfortable Bluetooth® communication experience” .(p.5)

• You may be able to improve the connection status by switching the connection codec to SBC. If you are using a connected device such as a smartphone or audio player that can change the connection codec, you may be able to set to SBC on
  that connected device. For details about the setting procedure, refer to the user manual of your connected device.

• Refer to “Turning SBC priority connection mode on or off” (p.14) and change the connection code to SBC.

Cannot hear the voice of the caller /
Voice of the caller is too quiet.

• Turn on the power of the product and the Bluetooth device.
• Turn up the volume.
• Make sure that this product and Bluetooth device are connected by the HFP/HSP (or call connection).
• Disable pairing for this product and the Bluetooth device, then pair the product with this device again.
• Switch the sound output of the Bluetooth device to this product.

The charging case cannot be charged

• Securely connect the included USB charging cable and charge the product

Headphones cannot be charged.

• Make sure that the product is placed in the charging case correctly.
• Charge the charging case.
• Wipe dirt off the charging terminal with a dry cloth.

The ear detection does not work.

• Check if the ear detection is on. It is turned off at the time of purchase.
• Wear the headphones properly on your ears.
• After removing the headphones from the charging case, check that the indicator lamps on the headphones are flashing (ready to use) before wearing them. The ear detection may not work correctly if the headphones are worn while the indicator lamps are not flashing.
• For details about how to operate your Bluetooth device, refer to the device’s user manual.
• If the problem still remains, reset the product. To reset the product, refer to “Reset function” (p.17) under “Using the product”.

Specifications

Headphones

Type                                      Dynamic
Driver                                   5.8 mm
Sensitivity                             98 dB/mW
Frequency response              20 to 20,000 Hz
Impedance                            16 ohms

Microphone

Type                                   MEMS type
Polar pattern                      Omnidirectional
Sensitivity –                        38 dB (1 V/Pa, at 1 kHz)
Frequency response           100 to 10,000 Hz

Communication specifications

Communication system                         Bluetooth version 5.0
Maximum RF output                            10 mW EIRP
Maximum communication range          Line of sight – approx. 10 m (33′)
Frequency band                                    2.402 GHz to 2.480 GHz
Modulation method                             FHSS
Compatible Bluetooth profiles            A2DP, AVRCP, HFP, HSP
Support codec                                     Qualcomm® aptX™ audio, SBC
Supported content protection method SCMS-T
Transmission band                               20 to 20,000 Hz

Specifications

Other

  Power supply|  Headphones: DC 3.7 V lithium polymer battery/
Charging case: DC 3.7 V lithium-ion battery
---|---
  Charging time|   Headphones: Approx. 2 hours1 / Charging case: Approx. 2.5 hours1
  Operating time|   Continuous transmission time (music playback): Max. approx. 6 hours1
(headphones), Max. approx. 30 hours1 (if charging case is used in combination)
  Weight|   Headphones: Approx. 4.7 g (0.17 oz) (L side), approx. 4.7g (0.17 oz) (R side)
Charging case: Approx. 49.7 g (1.8 oz)
  Water-resistant (drip-proof)
performance|   IPX2*2
  Operating temperature|   5 °C to 40 °C (41 °F to 104 °F)
  Accessories|

•   USB charging cable (30 cm (12”), USB Type-A / USB Type-C)
• Eartips (XS, S, M, L)

  Sold separately|

•   Eartips

1 The above figures depend on operating conditions.
2 Headphones only.

For product improvement, the product is subject to modification without notice.

• The Bluetooth® word mark and logos are owned by Bluetooth SIG, Inc. and any use of such marks by Audio-Technica Corporation is under
  license. All other trademarks are property of their respective owners.

• USB Type-CTM is a trademark of USB Implementers Forum.

• Qualcomm aptX, cVc and Qualcomm TrueWireless are products of Qualcomm Technologies, Inc. and/or its subsidiaries. Qualcomm is a
  trademark of Qualcomm Incorporated, registered in the United States and other countries.
  aptX and cVc are trademarks of Qualcomm Technologies International, Ltd., registered in the United States and other countries.
  Qualcomm TrueWireless is a trademark of Qualcomm Incorporated.
  Specifications 139507540

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