Skyblue Vinne Bear Portable Mini Stereo Speaker for Smartphones, Tablets, Laptops , Mp3 Players, and More Devices 3.5mm USB 2.0 Output Power(RMS): 3W;Buil-in rechargeable polymer battery lasts up to 6 hours of continuous use. Switch to save battery life while not in use. Red light-charging; Blue light-charging full/ working. USB Cable Length: 14 inch