SPECIFICATION: Moddel: EA107 Bluetooth version: V5.0 Bluetooth solution: HFP, HSP, A2DP,AVRCP Frequency range: 20Hz-20KHz Connection distance: 10m Impedance range: 32Ω±5% Earbud battery capacity: 100mAh Playback time:  -8h (volume Ot 70%) Charging interface: Micro USB