This set of 4 instant alarms are the perfect inexpensive way to protect your home. Simply peel off the self-adhesive backing, stick in place, and turn on the switch! These battery-powered units will sound a 90 decibel siren when the two halves are separated by the opening of a door (sliding or hinged). Install in seconds without tools or wiring, and always be aware of who's in your home.
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Very loud and easy to use.