Audio streaming from Smart Antenna SM20/SM21 to the car’s stereo is possible if AVRCP 1.5 is supported in your car. For examples you can stream music from a MP3 Player or smartphone. Furthermore, depending of car model the connection of Smart Antenna SM20/SM21 can be made via smartphone or car stereo.
FIAMM recommends first to connect the phone to the car in order to avoid any problem with the communication between smartphone and the car.