Package Includes: 1 x Aux Cable Bluetooth Adapter, 1 x Microphone. Quality Material: Made of quality metal and plastic material, durable and practical to use. Installation: Remove the CD host player, the large plug into the plug in the back of the corresponding audio interface. This is a bluetooth cable with large plug, which can be directly inserted into the corresponding large plug interface of the original car's CD host. Open the phone's bluetooth, search bluetooth and click on the link. The car CD switch to Aux mode. Compatibility: The product supports music transmission, bluetooth version 5.0. Match your phone or other devices to bluetooth module. Choose Aux from your radio, then you can use your phone to play music through car speakers. Before purchase, you need to check whether the CD host has AUX function. If the CD host does not have AUX function, the product is not suitable. Fitment: for BMW E46 320i 320ci 320cic 323i 323ci 323cic 325i 325ci 325cic 328i 328ci 328cic 330i 330ci 330cic M3 Coupe Sedan Convertible 2002-2006. Note: Will work ONLY for BMW E46 3 Series Business CD head units since 2003 or newer, The E46 Business CD head unit manufactured time must be 2003 or newer.