Bluetooth speaker portable speaker power rating 3 watt speaker system 10 mono principle active frequency response 20 20000 hz impedance 4 ohm power supply rechargeable battery battery life 4 h charge time 4 hrs battery capacity 500 mah charging port micro usb colour blue control feature bluetooth pairing design mini speaker number of full range drivers 1 analogue input 35mm jack line in other connections micro usb wireless transmission b