These are great noisemakers. They pack a powerful punch for their size. I know if were a burglar and one of these went off you wouldn't catch me hanging around. We use these on our windows too.
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We already have one of your color digital video security systems for our house but I wanted something a little "extra" as a deterrent. The cameras work great, but I wanted something additional to scare the potential intruder. These work great. We bought one unit for each of our windows on the ground floor and for our doors.
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