The Braven 625s Bluetooth Speaker/PowerBank features 2x custom HD audio drivers provide stereo audio amplified by left and right channel passive sub woofers. A 3w speaker output will enable your audio permeate the large open spaces around you. Can be used wirelessly with any Bluetooth device. If your device isn"t Bluetooth compatible, you can still connect using the included 3.5mm audio cable. With a 1700 mAh portable USB power bank, the Braven 625s can play music, take calls and provide a soundtrack for other media for up to 16 hours. This same power bank can be used to quickly recharge other USB mobile devices while you"re exploring the outdoors. The shock absorbing exterior housing enables the Braven 625s to keep up with you on your outdoor adventures. The benefit of having a built-in power bank extends beyond charging your phone, it can also power the included LED flashlight via USB. We included a water-resistant dry bag to help protect it from the elements to keep you moving rain or shine. Our functional lanyard will keep your speaker close while taking advantage of the extended range audio drivers. Take your calls wherever you are using the built-in speakerphone. The internal mic is compatible with Bluetooth enabled phones, Face time, iChat, Skype and other applications (not all phones will support these features).