Bluetooth speaker portable speaker outdoor speaker power rating 40 watt speaker system 20 stereo principle active frequency response 70 20000 hz amplifier type digital x2 power supplies usb rechargeable battery battery life 15 h charge time 3 hrs type of battery lithium ion battery capacity 10 000 mah colour blue functions bluetooth multipoint speakerphone function smartphone charger protective properties splashproof controllable via buttons c