1. Can connect external audio source. 2. Backward compatible with Bluetooth 2.0 3.0 4.0 versions 3. Support MP3 audio format as well as WMA, WAV and other high-quality audio formats. 4. Great experience to enjoy music from your phone when driving. 5. Easy to install. 6. Black: Ground GND; Red: 12V ACC 7. Fits for 09/2002- 2006 BMW (E46): 320i, 320ci, 320cic, 323i, 323ci, 323cic, 325i, 325ci, 325cic, 328i, 328ci, 328cic, 330i, 330ci, 330cic & M3 (Coupe, Sedan & Convertible) Note: Will work only for BMW E46 3 Series Business CD head units since 09/2002 or newer , The E46 Business CD head unit manufactured time must be 09/2002 or newer
