Bluetooth speaker portable speaker power rating 12 watt effective output 5 watt speaker system 20 stereo principle active frequency response 50 20000 hz amplifier type digital power supply rechargeable battery battery life 12 h colour blue functions streaming speakerphone function nfc control feature bluetooth pairing design mini speaker number of full range drivers 2 full range chassis 40 mm number of passive radiators 1 analogue input 35m