Cars & Tech by JDM City provided this great review of the CoolStream CarPro for Audi. From years 2004 up through 2019, Audi provided an iPod cable in the glovebox for music streaming. The CarPro is designed to fit onto this cable.
In their recent CarPro review, Cars & Tech Review by JDM City tested the CoolStream CarPro for Audi. The CarPro is highly recommended by Cars & Tech.

“If you own an Audi, VW, or Benz from around 2008 to around 2015, there is a good chance your car has Bluetooth but can’t stream music. This adapter lets you add Bluetooth streaming.”
Check out their video review here.
The CarPro review states how simple the setup can be. “Installation: Plug it in, and connect to it via your phone’s Bluetooth settings. The light blinks blue when it’s searching and solid blue when paired.”
One of the highlights for the reviewer is how well the CarPro will work seamlessly with Audi’s hands-free Bluetooth when making or receiving phone calls. You can pair your phone to both the car – for making phone calls and the CarPro for streaming music. When a call comes in, you answer it as you always have. The CarPro will pause the music while you take your call. As soon as you hang up, the CarPro will resume the music right where you left off.
You can also read their full review of the CoolStream CarPro on their website.