We have a security system in our house. Sensors on the 3 lower doors and on all 1st floor windows, plus glass break sensor. We don't turn it on at night in case we have to take the puppy out, but we do arm it when we leave to work or when we travel. It's mostly for the wife's peace of mind while I'm away for work. Don't think we'd have had a system installed if there wasn't already one in place though.