Bluetooth speaker sound tower power rating 60 watt system 2 way system speaker system 21 system principle active frequency response 20 20000 hz power supply mains operation colour black functions smartphone charger usb host streaming controllable via buttons remote control control features playpause volume control onoff bluetooth pairing number of tweeters 2 number of subwoofers 1 analogue input 35mm jack line in digital inputs usb wire