We bought these to complement our existing alarm system. They are easy to use but we had SEVERAL FALSE SIGNALS! One of them kept working in the middle of the night! HOORAY! I contacted the seller and he sent me a replacement. However, the survivor has also worked a couple of times. I had to fiddle with the settings to get it down to its lowest sensitivity. Closing the door too tight or the wind is blowing too hard can cause them to work. I would recommend a link. Of course, the seller is cooperative.
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