Cewaal Waterproof Bluetooth Speaker, Outdoor/Shower CRS 4.0 Stereo Portable Sports Speaker,Light Weight,Built-in Microphone,Hook,Compatible with all Audio Devices 1.Full, High-Def Sound: Enjoy an impressively full sound quality and robust bass realized through a 3W audio driver and passive subwoofer. 2.Perfect sound quality and effect, when you go out to enjoy unfettered music anywhere stereo Bluetooth transmission. 3.Incredibly Compact: This ring box-sized bluetooth speaker fits easily into your jacket pocket or the small side pocket of your backpack. 4.Waterproof IP65, Dustproof, Anti-scratch, Shockproof,Rechargeable, suitable for both indoor and outdoor exercise. 5.Aux in function support all digital audio device with 3.5mm jack, such as iPod/iPhone/ipad,Cell phone,MP3, MP4,Computer, Notebook, PSP.