... used for car audio,mp3 player,common civil life support SD ... ( Optional)Used forcar audio,common civil life,subwoofer,mp3 player,mini readerScreennoControllerwireless remote controlSupply ability1000 pcs per dayPacking800 ... and USB disk to play musicMusic file format : MP3 file formatPower Input : DC 12V (It can be ... to mini reader, mini amplifier, inserted card mp3 player, mp3 audio, car audio,hi-fi ...