?Steering Wheel Control & Plau and Play?Plug and Play Wired Harness supplied,easy to install(few cars swc cables requires manual wiring,contact us if swc does not wrok),supported car original steering wheel control button programme and customize(click Settings in the main menu, go to factory and input password 3368, choose LZ(HZ)-Audi-A4-LZ). ?Bluetooth & DSP & WiFi & Dual navigation?Hands-free calling and answer,making your call more safe when driving,built-in microphone,external microphone is optional, please contact us in need.DSP surround sound processing can customize the best music sound playback effect of different seats according to your needs.Support WiFi or hot spot function,very convenient to download APPs, offline map and so on,suppport internet location and GPS satellite positioning,make your navigation more precise. ?Wireless/Wired CarPlay & Android auto?Wireless Carplay and Android Auto connected with Bluetooth,click carLink icon to start CarPlay or Android Auto function or back to main page, Wired contected way with the 6 pin USB cable,the 4 pins usb cable only for charging,very convenient to operate,free your hands,keep you stay focused and enjoy entertained while driving. ?Android Car Radio Upgrade?Customization Android system,with 4-Core 1.2Ghz CPU,2GB RAM,ensures smooth operation and faster response,32GB ROM for more apps installed,1280*800 HD Touchscreen fouth-gen IPS display,color richer and display clearer,Screen Display Resolution 1280x800, Video output resolution 1024x600 (to external monitor). ?Changeable UI Car Stereo Radio? 9 inch capacitive touch screen In-dash video player for Audi A4 Avant 2001 2002 2003 2004 2005 2006 2007 2008,Audi A4 Convertible 2002 2003 2004 2005 2006 2007 2008,Audi S4 B6 B7 2003 2004 2005 2006 2007 2008.