Bluetooth speaker power rating 25 watt speaker system 20 stereo principle active frequency response 50 25000 hz impedance 6 ohm power supply rechargeable battery battery life 12 h battery capacity 6 600 mah colour grey functions speakerphone function nfc smartphone charger control feature bluetooth pairing analogue input 35mm jack line in digital inputs usb analogue outputs headphones output other connections usb wireless transmission blue