Product information: Bluetooth version: 5.2Supported protocols: HSP/HFP/A2DP/AVRCPCharging interface: Type-CInput current: DC 5VOutput current: 3.7V/50mAhHorn: 13mm high quality moving coilFrequency response range: 20Hz-20000HzHeadphone battery: 30mAh *2Charging box battery capacity: polymer 200mAh...