Direct Connection via CD changer port with CD quality sound. Control music files from your car radio panel or steering wheel. Supports USB flash drive, SD card, and 3.5mm jack input. Built-in high-quality MP3/WMA decoder. Built-in amplifier chips. No signal interference. No battery required. Easy to install and use. Installation Instructions: 1. Turn off car engine and remove key from ignition. 2. Remove car radio from the dashboard to access the back of the radio. 3. Locate CD changer port and plug the car MP3 interface cable connector into it. Ensure a secure connection. 4. Insert USB stick or SD card into the car MP3 interface. Turn on radio and press CD (Disc/Mode/CDC/AUX) button until "CD-X-X" appears on the radio screen. Check left and right audio output and test track control. 5. After successful testing, reinstall the radio and secure the car MP3 interface in a suitable location. Item Type: Cables, Adapters & Sockets Voltage Input: DC 12V Signal-to-Noise Ratio: 95dB Maximum Current: 600mA Frequency Response: 20Hz–20kHz Working Temperature: -10°C to 80°C Total Harmonic Distortion: 0.01% Color: Black + Yellow Material: PVC + Copper Compatibility: 6+6PIN interface Note: Please verify your vehicle compatibility before purchase. If you are unsure whether your car is compatible, contact customer service. Do not purchase if your vehicle is not listed. Compatible with: 4Runner 2003–2011 Venza 2009–2011 Celica 2003–2005, 2005–2011, 2007–2010, 2004–2011 Land Cruiser 2003–2011 Matrix 2005–2011 Mark X 2005–2011 MR2 2004–2010 Vitz 2006–2010 Yaris 2006–2011 Lexus ES 300/330 2004–2011 IS 220/250/300/350 2006–2011 GS 300/400/430/450H 2006–2011 GX 470 2004–2009 GS 460 2007–2011 LX 570 2008–2011