... cassette and FM transmitter solutions. Directly control from car stereo panel,user only need a SD card ... enjoy the digital music(MP3/WMA) in your car,Aux input for external audio sources,Auxiliary devices ... transmitter solutions.Control Digital Music changer from your car redio buttons.Works also with steering wheel controlsSupport ... Panasonic, Sony, Alpine,M-bus, Clarion,Ce-net, Pioneer, and Sanyo.