Bluetooth Speaker,ELEGIANT Portable NFC Bluetooth Wireless Stereo Speaker,Waterproof Crashproof Dustproof Sports Outdoor Speaker for Smasung,iPhone and Most Bluetooth Devices(Black) Bluetooth 4.0 and NFC sensing function. Perfect sound quality and effect, when you go out to enjoy unfettered music anywhere. Stereo Bluetooth transmission,strong output power with outstanding sound quality. Waterproof,Anti-scratch,Shockproof, Rechargeable, suitable for both indoor and outdoor exercise. Built-in 3600mAh Battery Capacity,can charge cellphone and other device by USB cable.