Features: This 4pin and 12Pin connector is inserted into the back of the CD host connector.connect your phone with BT. BT 5.0 version, and compatible with 2.0 3.0 4.0 5.0 other versions of BT, can support the commonly used MP3 format o, but also support the WMA WAV FLAC, and other highquality o format decoding, nonordinary BT functions, can support DSD large capacity transmission. Choose AUX from your radio and you can play music from your phone in your car. Match your phone or pad to BT module.and Choose Aux from your radio, then you can use your phone to play music through car speakers. You can hear music from your phone/pad/mp3(They should have BT function). P.S:Only o 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. Replacement for MMI AMI 3G. Replacement for Q5, A4L, A6L, Q7, A5, S5. 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 original MMI system, press SETUP+CAR five seconds Enter the green menu project module, find the AMI modified code AMI changed 1/2. Specifications: Material: ABS & metal BT: V5.0 Range: 5m Dimensions: 3x5.3x0.5cm/1.18x2.09x0.2inch Packing List: 1PCS Aux BT cable