New vehicle security
HELP!! I just bought a 2006 Yukon Denali and it has an aftermarket security device installed. It is a green LED that has a small switch on the back of it that says off and on. It also has the "key fobs" on the regular key ring. When the switch is off the LED stays on until I start the car. When its on, it flashes. Can anyone tell me what kind of security device this is, how it works, etc.? The only thing that I have to go on is a sticker on the window that says something like "this vehicle protected by invisible security device that is tracable by the police". That may not be an actual quote but its close. Any help would be appreciated!!!