1、High compatibility, support common MP3 format audio, also support for WMA, for WAV, for FLAC, and other high‑quality audio format decoding. 2、Can provides stable data transfer, hi‑fi and efficient music transmission, perfect for music enthusiasts, support DSD Large‑capacity transmission. 3、Adopts Bluetooth 0 protocol, backward compatible with other versions of Bluetooth protocol like 0, 0, 0. 4、Match your phone or pad to bluetooth module, choose Aux from your radio, then you can use your phone to play music through car speakers. 5、You can hear music from your phone/pad/mp3, support call answer function with clear sound. 6、Professional manufacturing for high quality, stable connection, outstanding performance, plug and play simple installation. 1 x Microphone1 x AUX Bluetooth Adapter Item Type: AUX Audio CableMaterial: ABSVoltage: DC12VBluetooth: Bluetooth 5.0Microphone Cable Length: Approx. 150cm/ 59.1inFitment:Fit for A2 2006 onwards with Quadlock connector and AUX button or AUX displayed when scrolling through available sourcesFit for A3 2006 onwards with Quadlock connector and AUX button or AUX displayed when scrolling through available sourcesFit for A4 2006 onwards with Quadlock connector and AUX button or AUX displayed when scrolling through available sourcesFit for TT 2006 onwards with Quadlock connector and AUX button or AUX displayed when scrolling through available sourcesHow to Use: 1. Find the 12pin socket on the car (on the back of the radio). 2. Install it directly and install the power cord.