welcome to our shop! Type: 3G Bluetooth 5.0, 4 speeds Enable functionality via Bluetooth-enabled devices Car radio has no functional limitations Gives you access to external audio sources From smartphones to car stereos Pair your phone with our Bluetooth module and Aux your radio. Easy to install, plug and play. Easily accomplished via Bluetooth, no complex code required to connect. Specification: type: Material: ABS Colour: Black compatibility: Suitable for A3 A4 B8 B6 A6 C6 B7 C6 C5 C7 Q5 A5 A7 R7 S5 Q7 A6L A8L A4L Install: 1. The black cable connects to the 3G system. Make your aux in active green (toggle "media" and toggle "aux") 2. Insert the CD player (please confirm the corresponding connector), connect the mobile phone to the Bluetooth module and aux sound source, and then the mobile phone music can be played. packing list: 1 x Bluetooth 4 x installation tools Notice: Please make sure your car has a - music interface, it is usually located in the armrest or box, without this interface you will not be able to connect to this product. We cannot 100% confirm that a vehicle is over its age. Please make the connector to fit your car before ordering. You will need to remove the stereo to install this kit into your car. Contains only the above package contents and does not include other products. 1. Please allow 1-3mm error due to manual measurement. Thank you for your understanding. 2. Monitors are calibrated differently, and the color of the product shown in the picture may be slightly different from the actual product. Please refer to the default authentic product. (Customer satisfaction is our top priority. If you find any product problems after receiving the goods, such as damage or incorrect quantity, please contact us immediately. We will try our best to provide you with satisfactory after-sales service. Thank you for getting to know me. I hope this helps you. wish you a happy life.