Specification:
• Model: M19
• Bluetooth specification:V5.1
• Bluetooth Profile:A2DP,AVRCP, HFP;HSP
• Working voltage:3.1V~4.2V
• Charging voltage:5V-1A
• Battery capacity of the headset: 50MAH
• Battery capacity of the storage box:2000MAH
• Transmission distance:>10M