[willy]

that is actually old school two legger stuff MJ
now they have gone electronic with these cheap special readers.
they sit in parking lots, they have to be within about fifty feet of you, when you use your remote to lock your car the reader reads the signal.
when you are inside they walk up and hit the button and turn everything off including alarms just like you do with your remote.

so another tip which I do is never lock your car with the remote in malls or other busy locations like parking garages wally marts etc. Use your manual lock on the door on the way out.