Bluetooth speaker power rating 10 watt speaker system 20 stereo principle active frequency response 60 20000 hz impedance 2 ohm power supply rechargeable battery battery life 12 h battery capacity 4 400 mah charging port micro usb colour black front colour black housing material plastic enclosure functions speakerphone function nfc control feature bluetooth pairing design mini speaker analogue input 35mm jack line in analogue outputs hea