Aluminium high quality material Power bank function Camera shutter function Aux-in Low battery warning Led lighting buttons Useful torch light function Special alarm function Rechargeable battery Power indication light Automatic bluetooth pairing Microphone for hand-free function With rubber feet for shaking-resistant Bluetooth chip:bk v2.1+edr Drive size: 2.25"*1 + 1.25"*1(treble driver) Power:5w*1 + 1w*1(treble driver) Distortion :