Bluetooth speaker power rating 6 watt effective output 70 watt speaker system 21 system principle active frequency response 150 18000 hz power supply rechargeable battery charging port micro usb colour black function streaming control feature bluetooth pairing design mini speaker number of full range drivers 1 full range chassis 15 mm number of subwoofers 1 bass chassis 38 mm analogue input 35mm jack line in other connections micro usb i