... with existing cassette and FM transmitter solutions. Directly control from car stereo panel,user only need a SD card or USD disk ... sound .no FM noise2.Control Digital Music Changer from your car radio buttons or steering wheel.such as Track+/- /Disk+/-/Ppt ... 6.Easy to install and use. compatible with car radio :Toyota, Honda, Volkswagen, Nissan, Ford, GM, Chrysler, Mazda, Hyundai, Subaru, Audi, Skoda ...