Type: 3G Bluetooth 5.0, 4 speed Function via Bluetooth-enabled devices No functional limitations of the car radio Allows you to connect an external audio source It is possible from your smartphone to your car stereo to Pair your phone with bluetooth module, and Aux from your radio. Easy installation, Plug & Play. Easy via Bluetooth without complicated code connections. Specification: Type: Material: ABS Colour: Black Compatibility: For A3 A4 B8 B6 A6 B7 C5 C7 Q5 A5 A7 R7 S5 A6L A8L A4L Installation: 1. Black power cable connected to 3G system . Make that is your aux in enabled in green (swich "media" and swich"aux") 2. Plug into the CD player ( confirm corresponding socket), mobile phone is connected with the Bluetooth module, aux audio source , you can play mobile phone music. Package includes : 1 x Bluetooth 4 x Install tool Note: confirm that your car with a - Music Interface, it is generally in the armrest box or storage box, without this Interface will not be to use this product. We 't confirm 100% to compatible above car model years . make that connector can fit for your car you order it. You will need to remove the stereo to fit this kit to your car. Only the above package content, other products are not included. Note: Light 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.