Direct Connection via CD changer Port with CD quality sound,Control music files from your car radio panel or steering wheel.Support USB Flash, SD Card and 3.5mm jack input.Building in high quality MP3/WMA decoder,Building in Amplifier chips,No signal interfere, No battery required,Smart design and Easy to install and use,Brand New and High Quality Work Theory: 1. Turn off car engine and remove key from ignition. 2. Remove car radio from the dash in order to get assess to the back of radio. 3. Find CD Changer port and plug Car Mp3 Interface cable connector into it, make sure firm connection. 4. Plug USB stick or SD card into Car Mp3 Interface. Turn on radio and press CD (Disc/model/CDC/AUX) button until "CD-X-X" appear on radio screen. And play music to check left and right sound. And test if can control radio track +/-,Disk +/-. 5. After all test are ok, assembly radio and put Car MP3 Interface in the proper place. Item type: Cables, adapters & socketsVoltage input: DC 12V;Signal-to-noise: 95DB Max. current: 600mA;Frequency response: 20HZ-20KHZ;Working temperature: -10-80 Celsius degree;Total Harmonic Distortion: 0.01% colour: Black + yellow Material: PVC+copper Car Compatible with: ( it is 6+6PIN interface) NOTE: Please check the product of all compatible with the range, and then buy the product. If you can not determine whether your car is compatible. Please contact our customer service. If your car does not fit the above compatibility, please do not buy. Otherwise it will not work. For Toyota: 4Runner 2003-2011 Camry 2005-2011 Tundra 2004-2011 Venza 2009-2011 Celica 2003-2005 Corolla 2005-2011 FJ Cruiser 2007-2010 Highlander 2004-2011 Land Cruiser 2003-2011 Matrix 2005-2011 Mark X 2005-2011 MR2 2004-2010 Vitz 2006-2010 Yaris 2006-201 FOR Lexus ES 300/330 2004-2011, IS 220/250/300/350 2006-2011 GS 300/400/430/450H 200