Shenzhen Kingstar Industrial K400 TWS Earbuds User Manual
- June 5, 2024
- Shenzhen Kingstar Industrial
Table of Contents
Shenzhen Kingstar Industrial K400 TWS Earbuds
FCC Statement
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 into 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.
Caution
Any changes or modifications to this device not explicitly approved by the manufacturer could void your authority to operate this equipment. 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. RF Exposure Information The device has been evaluated to meet general RF exposure requirements. The device can be used in portable exposure conditions without restriction.
HOW TO USE (TOUCH BUTTON)
Touch Button
- Power on Long press 3s
- Power off Long press 5s
- Play/Pause One click
- SIRI Four clicks
- Answer the call One click
- Refuse the incoming call Double click
- Hang up the call One click
- Volume + Three click (R)
- Volume -Three click (L)
- Previous song Double clicks (L)
- Next song Double clicks (R)
HOW TO POWER ON AND PAIR THE EARPHONES
Take the headset out of the charging compartment to automatically turn on, the
red and blue lights flash alternately,and enter automatic pairing.After the
pairing is successful: the red and blue lights on the main ear flash, and the
blue lights on the secondary ear flash once every 5 seconds. 
- After using the earphones, it will automatically connect to the phone.
- Earphones will automatically turn off if there is not connected to the phone in 5 minutes
CHARGING STATE
- When the charging box is charging, the blue light flashes according to the battery level (0-100%).
- The red light is on when the headset is charging when the earphone is fully charged, the blue light is on for 30 seconds and then goes out
- the headset Low battery alarm when the battery is lower than 3.3V; automatic shutdown when the battery is lower than 3.1V; Every 30 seconds there is a low battery prompt; and the red light flashes.
PRODUCT PARAMETERS
- Bluetooth version: BT 5.0
- Transmission distance: 10M
- Earphone battery: 55mAh
- Charge box capacity: 1000mAh
- Talking time: 6-8h
- Charging time: 2-3h
- Charging case voltage: 5V
WARNING
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