1. Bluetooth version: V5.1
2. Speaker: bone conduction vibrator speaker
3. Battery capacity: 170mAh
4. Life time: about 12 hours
5. Charging time: 2 hours
6. Bluetooth distance: about 15 meters
7. Support functions: music play, pause. Incoming calls are answered, but rejected. Ios battery display, automatic connection, call siri voice assistant, etc., caller ID.
8. Headphone size: 6.7x5.2x1cm