Bluetooth speaker portable speaker power rating 36 watt system 2 way system speaker system 20 stereo principle active amplifier type class d x2 power supplies usb rechargeable battery battery life 24 h charge time 2 hrs type of battery lithium polymer battery capacity 2 600 mah colour green function nfc led displays battery level indicator onoff controllable via buttons remote control app control feature bluetooth pairing number of tweeters 2