Alarm C280 1996

Does anyone have details on the factory alarm? My car has the Red and Green lights on the bottom of the mirror and the unlock/lock remote integrated along with the key. It does disable the engine if you do not use the key but does not have a siren or lights flash (alarm) installed. Is there a place to get the alarm module? Is programming required to activate the alarm module?

Also, does anyone know if the car recognizes the master spare key and unlocks the starter disable? or would I be out of luck if I locked the car via the remote and used the master spare to open the car? My guess is that I could unlock the trunk and the car would start.

Thanks Much.