It is the factory remote unlock receiver. There is a smoke grey cover that goes over it. Remotes are expensive, last I called dealer wanted 170 for the remote, might as well install a new alarm for that price. Remotes pop up on ebay every now and then and go for ~50$. I have found the cover for it to be hard to find (took me 5 separate trips to wrecking yard). A write up has been done on how to change the receiver out to one of the new models, can't recall specifically where (jeepsunlimited, I think). Also there is a website where you can order the remote from a secondary company at
http://www.thejeep.com/piland.html Also this is the first year they offered it.
Hope that helps,
Kellen