It appears you're referring to keypads and not the actual alarm panel. You'll want to locate somewhere in your home, a beige or red box about the size of a large phone book (14 x 12 x 4 inches). It may have a keylock on it. Inside is the actual alarm panel circuit board and battery. If you can locate that box, you should be able to tell us the model number and we may be able to help you more.
Common places for these "cans" as they're called are laundry/utility rooms, master bedroom closets, other closets, attics, basement, etc. They may or may not have multiple wires visibly running to them.