Can play MP3 format music from U disk and SD/MMC card directly,support FM stereo radio,Selected high-power four-channel professional power amplifier integrated circuits,minimal distortion but strong power,Amateur professional level input and operational amplifier IC for circuit design, parent and bright soundFiltering and anti-large-capacity power 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,Bass control:12dBSignal level:220MV 47K,FM frequency response:87.5 - 108MHz,Power:20W x 2color:red Material:aluminum alloyProduct size:15.5 x 8.5x 4cmPackage Contents:1 x HY - 400 Power Amplifier1 x Remote Control1 x English User ManualOnly the above package content, other products are not included.Note: Light shooting 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.