
These little door alarms are great especially for the price. My husband takes medication that makes him sleepwalk. I was afraid he would come out. Bought them to warn me when the doors are open. The volume that such a small device produces is a big surprise. I hear them upstairs. When I first saw the packaging I was worried they wouldn't work as the two pieces looked like they needed to be perfectly side by side. In our home, this would not have been possible due to the moldings on the outside of our doors, resulting in one side being more recessed than the other. (See photo - quarters for size reference). It's not a problem at all. The individual parts appear to be close enough together that when the door is closed the alarm is on but doesn't work. There is a handy on/off (armed/disarmed) switch on the side, which is very easy to use. And they stick to the door almost too well. This. do not peel or stick the mount unless you are sure. They will not come off without damaging the wall or the alarm. The batteries are easy to reach (three button style for each alarm included at purchase) when the unit is attached. Just install it upside down if the door opens in the opposite direction. (see photo). I recommend.

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