Can play MP3 format music from U disk and SD/MMC card directly,support FM stereo radio, high- four-channel amplifier integrated circuits,minimal distortion but strong ,Amateur level input and operational amplifier IC for circuit design,transparent and soundFiltering and anti--capacity circuit,Four DSP sound field patterns,Two main channels and two surround channel output,Input voltage:DC 12V,Frequency response:20Hz - 20KHzHarmonic distortion:0.05pct and less ( 4W 1KHz ),SNR:85dB,High control:12dB, control:12dBSignal level:220MV 47K,FM frequency response:87.5 - 108MHz,:20W x 2color:red Material:aluminum alloyProduct size:15.5 x 8.5x 4cmPackage Contents:1 x - 400 Amplifier1 x Remote Control1 x English User ManualOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.