As an added deterrence, use these driveway alerts from Haborfreight.

http://www.harborfreight.com/wireles...tem-62447.html

One on porch, one on back porch/deck/driveway. I've caught several folks wandering around before. One on my porch has the volume on HIGH and it's outside. Scares the crap out of whomever comes to the front door. Poor UPS guy. It makes them look up and usually right at the camera. Smile.