Bluetooth Music Adapter, Plug and Play Bluetooth connection, only when ignition is on Allows you to stream music to your car radio via the Bluetooth function of your phone/smartphone. No car radio function limitations. Allows connection of external audio sources. Bluetooth 5.0 version, and compatible with 2.0 3.0 4.0 other versions of Bluetooth Name: Audio Cable Adapter Bluetooth: 5.0 Voltage: 5-12V Applicable Models:For E46 3 Series 2002-2006 Installation:Red power cord connected to 12V+ Black power cord connected to 12V- Plug the CD player into the jack (please confirm the corresponding socket), connect the mobile phone to the Bluetooth module, and after selecting the aux , you can play the mobile phone music. Note! Some host cannot activate AUX through MODE. At this time, the host has no AUX function and cannot be used. Colour:Black Material:ABS Package Contents: 1PCS x Car Audio Aux Adapter Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.