1byone Door Stopper Alarm
Meet the 1byone Door Stopper Alarm: a door sensor with a motion sensor that lets you know when any door you are monitoring is opened. It can activate a +90dB alarm to keep intruders at bay. The device is compatible with all 1byone alarm receivers.
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This door sensor is battery powered and needs only 1.5V AAA batteries. Not too expensive either.
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