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The compact MAGNETIC DOOR ALARM utilizes magnetic attraction to trip the 110 decibel alarm. Bolt the base to the door or window frame and attach the sensor to the door or window. If the door or windows is opened, the alarm is sounded. This solution will work for most any door or window, even a sliding glass door. Three lithium button cell batteries are included.
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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