Digital Music Changer directly connection with Car radio via CD Changer port, without the loss of sound quality, support USB and SD card, directly control from car radio panel, compatible with most of OEM car radio Our auxiliary audio input device provides a clean audio path into many vehicle sound systems so you can enjoy untarnished sound from your video system, game system and other audio devices Features:1:Build in Amplifier chips2:Directly control from car stereo panel 3:No battery required4:Compatible with OEM Radio and aftermarket Radio5:Support USB disk and SD card and extend external audio sources6:Easy to intall and use7: No sigal interfere 8: One panel with different cable for different car9: High quality MP3/WMA decoder10:Small and delicacy,do not take much space
