... for Digital car cd changer: 1. CD sound quality ,NO FM transmiter noisy. 2. Support Widely extend source,USB disk, SD ... and play . Can work on : OEM Radio: .W ,AUDI,BMW, TOYOTA,HONDA,MAZDA,SUZUKI,NISSAN,Aftermarket Radio: SONY,CLARION,ALPINE,PANASONIC,BLAUPUNKT.ETC,,,