I bought this UGREEN Aux to Bluetooth 5.0 Adapter to add wireless audio to my older car radio, and it does exactly that. Setup is simple: plug the 3.5 mm AUX into the audio port, power it via USB, then pair from your phone. The built-in microphone works fine for hands-free calls, and Bluetooth 5.0 keeps latency low. Range reaches about 10 m in my experience, though it depends on the receiving device. It's tiny and easy to leave plugged in. Good value for cars or home stereos without Bluetooth.