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.
This door sensor is battery powered and needs only 1.5V AAA batteries. Not too expensive either.[where to get it]
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