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Alarm Sirens. Each emits a 90~100 db squeal. These were actually bought at the dollar store for just $1 each. They were
personal alarm keychains, those little things you carry with you so if you get mugged you pull the pin so the sound can
scare away the bad guys. Will all I did to modify them was to mount them to a hard surface to directionalize the sound,
take the pin out perminately, and connect the battery terminals to a wire so I can control when it turns on and off.
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