Best Audi S4 bluetooth audio head unit with usb sd mp3

This Audi S4 bluetooth audio head unit must be the one you want,it supports build in Bluetooth music,you can play music in your phone via bluetooth,it is easy to operate.link:http://www.seicane.com/audi-s4-dvd-player-gps-navigation-system-with-radio-tv-bluetooth-srd-8745-3 .