This device is under the dash on my '05 Patriot.
What is it?
The only thing I can come up with is that is a remote for the keyless "Baggage Compartment Doors".
Maybe also for the Entry Door, however my coach has the Essex Keypad entry pad too, and that device is on the passenger side behind the magazine rack (it also has a button to press to enter the programing mode).
I happen to have the center dash panels removed (I am getting them "Hydro Dipped") so I can see all the stuff jammed under the dash now.