I forgot to keep the original set which was ten years old and the batteries were corroded. I no longer used them and left them on fence posts to weather. Now I have video surveillance and there is no longer such a detector. However, since I wanted to keep the garage door and garage side door open to keep the garage cool for my two freezers, I bought a set of two detectors. I can see if someone enters a door. The doors are only open for a few hours to cool me off and I have peace of mind plus I have other safeguards.
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