I have an alarm which comes with 2 features:
Impact detection. i.e Someone tapping on doors or operating door handels
I'm not entirely sure how this works, but the second switch turns on a mode that sounds an alarm when anyone gets close to the car.
We had this installed in my father's van (which I now currently drive) back in 1994. I'll try to find out what company it is.
Are there any alarms like/similar to this in Pakistan?