Generic 7-Inch Car Audio System for Audi A4 2002 2003 2004 2005 2006 2007 2008 with Car Entertainment Steering Wheel Control 1)RDS, DVD, FM/AM Radio 2)Analog/digital TV tuner(optional) 3)IPod/IPhone 4/4S audio input 4)BT Phone Book, BT Music 5)MP5/SD/USB playing 6)Built in GPS, compatible 2D/3D map 7)Auto reversing viewing function 8)Compatible with external 500GB Hard Disk via USB port