I have one of those tOo but someone at the dealer told me that its the lo-jack....
The dealers do not know where the lo-jack sensors are, and they damn sure wouldn't put it out in plain sight. No one does except the lo-jack installers. They do it that way for a reason. Hell even you as a car owner... if you took your car to an authorized installation center and asked to have it installed. They would not allow you to watch and would not tell you where the senors are.