LVPIN LP-838 Car Motorbike Computer Power Amplifier HIFI 2.1 CD MP3 MP4 Stereo AMP with US Plug - Silver Mosfet Power 2.1CH Mini Hi-Fi Stereo Car Truck Motorcycle Amplifier High quality stereo sound and heavy bass output Automatic diagnosis work power source Special-purpose biplate integrated circuit; the output is big, timbre exquisite Works with MP3, MP4 and hi-fi systems