Qualir (AutoDVDGPS.com) Recommendation:  

• Cheapest special car DVD GPS player for Audi A4
• Unique button design
• 6.2" wide screen
• Steering wheel control
• Built-in DVB-T function is optional
• You can change the Startup Picture by yourself
• You can enjoy music and radio while navigation

Key Features:

• With built-in GPS system
• Built in TV tuner
• Built in radio tuner
• Built in Bluetooth
• iPod control
• Auto rear viewing function
• Steering wheel control
• Electronic & mechanical anti-shock system
• SD, USB port　
• Built in 4×45W amplifier
• NO RDS
• NO CDC
• NO CAN-BUS

Product Specification:
  1.Car PC Operating system: Windows CE 5.0
  2.GPS Processor: SAMSUNG S3C2440A-40
  3.RAM Memory: 64MB SDRAM
  4.Storage device: Support 4GB NAND FLASH maximal.
  5.Display output: CVBS, Y/C, YPbPr
  6.GPS receivers channels: 20
  7.Supported Maps: PolNav, IGO,ROUTE66,TOMTOM and so on.
  8.Multiple language supported: English, Deutch(German), Franch, Portuguese, Spanish, Italian and so on, totally 18 languages.
  9.GPS antenna: 1 in-dash GPS antenna interface on the back
  10.GPS dual zone: music or radio while in GPS Navigation mode
  11.Electronic & mechanical anti-shock system
  12.DVD formats played: DVD/VCD/CD/MP3/MPEG4/DIVX/CD-R/WMA/JPEG
  13.Media: all popular media can be read, including DVD/DVD-R/DVD+R/DVD-RW/DVD+RW/CD/CD-R/CD-RW/MP3/MP4(DIVX)/VCD/SVCD/US
  14.SD, USB port　
  15.Built in 445W amplifier (stereo)
  16.Bluetooth version: V2.0, Support AD2P (Bluetooth Stereo Music), can play stereo music through Bluetooth. Built-in microphone, can receive and dial phone calls
  17.Radio Frequency: Europe, USA1, USA2, Japan, Russian
  18.AM Frequency range: 522-1620 (Europe/China), 530-1710 (America)
  19.FM Tuning range: 87.5-108 (Europe/China), 87.5-107.9 (America)
  20.Stereo/Mono Switch (for FM): Yes
  21.1 video in/out
     2 audio in/out
     1 Aux in