<ul> <li>Full, High-Def Sound: Enjoy an impressively full sound quality and robust bass realized through a 3W audio driver and passive subwoofer.</li> <li>Perfect sound quality and effect, when you go out to enjoy unfettered music anywhere stereo Bluetoot h transmission.</li> <li>Incredibly Compact: This ring box-sized Bluetoot h speaker fits easily into your jacket pocket or the small side pocket of your backpack.</li> <li>Waterproof IP65, Dustproof, Anti-scratch, Shockproof, ReCharg eable, suitable for both indoor and outdoor exercise</li> <li>Aux in function support all Digita l audio device with 3.5mm jack, such as ipo d/iPhone /Ipa d ,Cell phone,MP3, MP4,Computer, Notebook, PSP</li> </ul>