For mmI 3G Bluetooth-Compatible 5.0 AUX Multimedia Bluetooth Adapter Audio Cable for A4 A5 A6 Q5 S5 f74 the bluetooth module is made for MMI 3G. Compatible for Q5, A4L, A6L, , A5, S5. This 4-pin and 12-Pin connector is inserted into the back of the CD host connector.connect your phone with bluetooth. Bluetooth 5.0 version, and compatible with 2.0 3.0 4.0 5.0 other versions of Bluetooth, can support the commonly used MP3 format audio, but also support the WMA WAV FLAC, and other high-quality audio format decoding, non-ordinary Bluetooth functions, can support DSD large capacity transmission. Choose AUX from your radio and you can from your phone in your car. Match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to through car speakers. You can hear music from your phone/pad/mp3(They should have blueooth function). P.S:Only audio playback, can not be steering wheel control, can not be used answer the phone. If you want to open the AUX function, this item needs to modify the code. Note: Select the 5053 into the 5F electronic module, and then select the match 10, into the channel 06, after reading, save the digital 0, the new data 1, and then into the MMI system, press SETUP+CAR five seconds Enter the green menu project module, find the modified code changed 1/2. Colour:As Shown Material:plastic Package Contents: 1 x Adapter Only the above package content, other 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.