... Music mobile, PSP game player, etcs Built-in lithium battery, built-in digital amplifier Pocket-size, high quality stereo ... sound. Material: ABSPower supplier: USB/Liithium batteryOutput: 2W*1Speaker Unit: 36mmOutput Impedance: 4ohmFrequency Responce ... Pocket-size, high quality stereo sound. Built-in lithium battery, built-in digital amplifier.Supports: iPod, MP3/MP4, ...