Specifications:
Bluetooth: Bluetooth 4.2+EDR
Bluetooth frequency: ISM 2.4 GHz-2.48GHz
Bluetooth effective range: 0-10 meters
Build-in rechargeable battery: 3.7V, 650mAh
Power output: 5V, 500mAh
Charging time: 2 hours
Hands-free working time: up to 16 hours
TF Card-play working time: up to 10 hours
Bluetooth Music-play working time: up to 9 hours