Usage Tips: AMI MDI to Bluetooth AUX and USB female car adapter cable for A4 A6 Q5 Q7 This is a wireless Bluetooth music adapter designed for models after 2009 with AMI interface or MDI. Compatible with all Bluetooth functions. Bluetooth version: V4.0 with EDR. Supports pairing with two smart devices simultaneously. Built-in noise reduction circuit ensures clear o transmission. Supports USB music playback and smartphone charging. Advanced wireless music technology enables smooth communication with mobile phones and tablets. Play, view, and control music from your phone or other music players with ease. Easy to install, plug and play. Simply plug into your vehicle's iPod media jack and enjoy music streaming from your Bluetooth device. Turn on the device to activate functionality.