Special function:
1, TMC (Optional) pip.
2, DVB-T Mpeg4: single frequency and double frequency (optional).
3, ISDB-T or ATSC-MH (Optional).
4, audi CAN BUS.
5, PIP6, IPOD: support IPOD insertion, and can operate IPOD in DVD interface.
6, Car info: Temperature, Range, Avg speed, Avg oil wear, Syn Time.
More details：http://www.oemcargps.com/audi-a4-s4-rs4-radio-dvd-gps-navigation-stereo-headunit-autoradio-p-645.html
