1. Bluetooth version: V4.1
2. Mono/Stereo: Stereo
3. Speaker type: bone conduction speaker
4. Battery capacity: 260mAH
5. Microphone: -40db noise reduction microphone
6. Standby time: about 10 days / playing time: about 8 hours / charging time: about 2 hours
7. Bluetooth effective distance: 10 meters
8. Bluetooth support protocol: a2dp/HFP, HSP, AVRCP, GAVDP, AVDTP
9. Bluetooth receiving sensitivity: 88dBm
10. Frequency range: 100Hz--20KHz