It's what you use to hook up aftermarket lights, nitrous, ect.. It's a switch panel to turn on and off lights, and it has a purge button for nitrous. It fits in your cup holder to make it easy to access and use. Thats the best I can explain it. lol.
Just click on Mustang parts for sale http://www.s197forum.com/forum/forumdisplay.php?f=12. ;) Don't forget to go to the bottom of the home page click on the page to introduce yourself and post a pic of your Stang!