ACEFAST AT9 Crystal Air Color Bluetooth Earbuds User Guide

ACEFAST AT9 Crystal Air Color Bluetooth Earbuds

Product Information

Device activation: when using it for the first time, please remove the protective sticker of the headset and put the headset into the charging case to complete the activation.

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Parameter / Product list

PC+silicone

Material|
Waterproof rating| IPX4
Operation frequency range| 2402-2480MHz
RF output power| ≤10dBm

Product list

Instructions for use

The left and right headsets are paired successfully by default when the product leaves the factory. Follow the steps below when connecting to the phone for the first time.

1. Take out the headsets to automatically turn on, wait for about 3 seconds, the headsets will be automatically paired.
2. Turn on the BT of the mobile phone, search for ACEFAST Crystal (Air) T9, and click to connect. After the pairing is successful, you will hear a prompt tone and the phone shows that it is connected. When you use it again, after the headset is turned on and paired, it will automatically connect back to the connected mobile phone. If you cannot connect to the mobile phone, please manually connect to the headset from the BT menu of the mobile phone.

Prompt:

• When the headset is connected to the device, in order to avoid the failure of the connection between the left and right headsets, the headset needs to be taken out of the charging case at the same time.
• You have 5 minutes to connect the headsets and your device, otherwise the headsets will automatically shut down. Put the headsets back into the charging case to re-enter pairing mode.
• Power on without any device connected, it will automatically shut down after 5 minutes.
• The left and right headsets can be used separately.
• If the pairing fails for a long time, please put the headsets back into the charging case for reconnection.
• If there is no sound after the left and right headsets are connected, please put the headsets back into the charging case for reconnection.

Operation mode (calls)

1. Power on:
2. Take out the headset, the headset will automatically turn on.
3. In the off state, touch the multi-function key once. After the headset is turned on, it enters the Bluetooth pairing state, and the LED light starts to flash.
4. Shutdown: The headset is automatically turned off when it is placed in the charging case.
5. Answering a call: when there is an incoming call, double-click the multi-function key.
6. End the call: during the call, double-click the multi-function key.
7. Reject the call : when there is an incoming call, long touch the multi-function key for 2 seconds.

Operation mode (playing music)

1. Play music: double-click the multi-function key or operate the player on the mobile phone (some mobile phones will automatically start the music player when connected to a BT stereo).
2. Pause the music: double-click the multi-function key or operate the player on the phone when playing music.
3. Next song: when playing music, triple-click the multi-function key of the right headset.
4. Previous song: when playing music, triple-click the multi-function key of the left headset.
5. Volume +: click the multi-function key on the right headset, there will be a prompt sound when the volume is at maximum.
6. Volume-: click the multi-function key on the left headset, there will be a prompt sound when the volume is minimum.
7. Wake up the voice assistant: long touch the left/right headset multi-function key for 2 seconds.

• Restore factory settings: long touch the left and right headset multi-function keys for 5s at the same time, the white light flashes, the reset operation is successful.
• Due to the characteristics of BT headsets, electromagnetic wave interference in the area may cause connection interruptions or freezes. Based on the characteristics of wireless technology, when the device performs the display function and transmits the BT sound signal at the same time, there may be a “delay” in the audio signal and the video signal, that is, the sound is not synchronized with the picture.

Operation method (charging)

Digital screen display:
LR and four power bars indicate the power of the left and right headsets. When the headsets are put in, the digital screen will turn off after 15 seconds. When the headset is charging, the battery bar will flash, when the headset is fully charged, the battery bar will be displayed normally.

• I：0~25%
• II：26%~50%
• III：51%~75%
• IIII：76%~100%

After the headset is placed in the charging case, the digital display area will instantly display the current power level of the charging case. When charging the charging case, the digital screen of the charging case will light up, the last digit of the battery will flash, and when the battery is fully charged, it will display OK.

Precautions for charging:
Use a charger with an output voltage of DC 5V, a USB port of a PC or a charger with a USB port output (must choose a charger that has been certified by a manufacturer).

Tips:

• This product contains a built-in rechargeable lithium battery, please read battery safety warnings.
• It is forbidden to hit, squeeze or throw into fire. If severe swelling occurs, please do not continue to use it. Do not place it in a high temperature environment. It is forbidden to use the battery after it is immersed in water.
• Do not try to remove the battery from the headset to avoid damage to the headset.
• The headset will automatically consume power when it is shelved. It is recommended to charge the headset every 3 – 6 months.

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