Car mp3 support USB/SD.AUX .
control the same like CDC.
plug and play.

Features : 1. CD sound quality ,NO FM transmiter noisy.2. Support Widely extend source,USB disk, SD card,(UP to 8GB).3.Control the device or music from your car audio buttons or steering wheel, such as, DISK+/DISK -, TRACK+/TRACK-/VOI+,etc.4.Easy installation ---Plug and play .Can work on :V.W ,AUDI,BMW, TOYOTA,HONDA,MAZDA,SUZUKI,NISSAN,SONY,CLARION,ALPINE,PANASONIC,BLAUPUNKT.ETC,,,