Bluetooth speaker portable speaker power rating 8 watt speaker system 20 stereo principle active frequency response 150 18000 hz sensitivity 80 dbmw power supply rechargeable battery battery life 8 h charge time 3 hrs type of battery lithium ion battery capacity 2 000 mah charging port micro usb colour black front colour black functions speakerphone function streaming controllable via buttons control features bluetooth pairing onoff volu