We made an Mobile, Wireless and powerful music system. The brain is made out of an Raspberry Pi 3 the biggest advantage is it has wifi build inside, the factor wireless is made. The raspberry pi makes an link from the phone to the stereo. An the iPhone you select airplay and the music will start playing on the stereo. You can change the volume and even stop and play the music. Every sound of the phone is streamed to the system. With means you can play from every app.