Bluetooth speaker portable speaker speaker system 21 system principle active power supplies rechargeable battery usb mains operation battery capacity 2 600 mah charging port usb colour silver controllable via buttons control features onoff volume control playpause bluetooth pairing speaker enclosures bass reflex carrying handle number of mid rangetweeter drivers 2 midtone chassis 76 mm number of subwoofers 1 bass chassis 130 mm analogue input