Feature: Direct Connection with CD quality sound Without the loss of sound quality that occurs with FM transmitter solutions Control Digital Music Changer from your car radio buttons Works also with steering wheel controls Support USB Disk and SD Card Building in high quality MP3/WMA decoder Building in Amplifer chips Widely extend external audio sources,like PC,MD,PSP,GPS Navigation and Mobile Phone DMC advantages 1. CD sound quality, no FM transmitter noisy. 2. support USB, SD card, 3.5mm jack input. 3. All-in-one product, one products can be compatible with a lot of different car series. 4. the same work theory as CD changer, support 6---99 folders play,maximum support 1000 songs play 5. control on car stereo control panel or steering wheel 6.full accessores:usb extend cable, 3.5 line audio cable,usb reader,tool for V.W Compatible with OEM Radio: Toyota, Honda, Volkswagen, Nissan, Ford, GM, Chrysler, Mazda, Hyundai, Subaru, Audi, Skoda Compatible with aftermarket Radio: Panasonic, Sony, Kenwood, Alpine M-bus, Alpine Ai-Net, Clarion and Sanyo.