Bluetooth specification:V5.3 Bluetooth Profile:A2DP,AVRCP,HFP, HSP Working voltage:3.1V~4.2V Charging voltage:5V-1A Speaker specification：8mm*2 Frequency response:20Hz~20kHz lmpedance:32Ω Battery capacity of the headset: 50MAH Battery capacity of the storage box:2000MAH Transmission distance:>10M Call Play time:About 4-6 h Charging time of headset:1.5h Charging time of the Charging box:2h
