Thank you for your visiting.Feature Discription:1800mAh Lithium Polymer battery provides up to 25hrs of music playback and recharges in 2hrs， independently testedwith a mix of medium and high volumes 2 X Proprietary speakers featuring a woven fiber composite diaphragm， extralarge spider and neodymium magnets are coupled to a 100mm passive bass radiator to give impressive bass down to 40Hz，detailed midrange and treble and long term reliability Flawless high strength aluminum enclosure with high quality fauxleather handle and spun aluminum brackets and buttons. The cabinet is critically damped with neoprene rubber to stop vibrations and standing waves. Bluetoothrange has been independently tested to 40 metres* Latest Bluetooth profile CSR BC5 is highly stable andwith the addition of a special noise suppression circuit speech via hands free calls is incrediblyclear.Package Contains: X05 Aluminium Bluetooth Speaker Ultimate Edition USB Cable Audio Cable Other Detailed features:Bluetooth Version: CSR 4.0Speaker Output power: 3W+3WFrequency: 40Hz~19KHzSNR: >50dBSound Box Voltage: 5VRechargeable battery: 3.7V 1800mAh polymer lithium battery