I would go with Wogs suggestion. Home Depot has a keypad motion sensor alarm for about $20. Give all the residence the code and put one inside the walkway at each door. For your door get a cheap magnetic contact alarm for the door for about 5 bucks. I have a security system for my house but one weak point is a cellar window, where if breeched nothing will go off and the guy is in the house. Boom, $5 bucks later and I sleep better.
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