I recently sold my Audi, so I don't need this any more. It's a genuine Ross-Tech HEX+CAN cable to connect to any VAG car (Audi, Volkswagon) from 1995 to current. This is the nice version of the tool with support for the new CAN bus the modules talk on. You can get extremely detailed troubleshooting info from this, I had a fuel injector go on me and not only did it properly diagnose the problem, it even gave me which injector number was failing so I didn't need to mess around, just order the injector and pop it in, do a code reset and go. You can re-program the options in the car with this, get the car to accept things like HID light modules when it came with halogen, or have the windows roll down via remote control instead of just the physical key, and lots more.

The true Ross-Tech cables are also a "dongle" giving you lifetime access and updates to the VCDS software. These sell for $350 + shipping, so you can save a bit off that here.

Here is more info:
http://store.ross-tech.com/shop/VCHUC.html

http://www.ross-tech.com/vag-com/index.html

Audi/Volkswagon Ross-Tech Scan/Reset Tool - Boston - 0-photo-2-jpgAudi/Volkswagon Ross-Tech Scan/Reset Tool - Boston - 0-photo-3-jpg