This is a Honeywell water detector add-on that works great in our basement. I ran it under a large window that sometimes leaks in heavy rain and it was small enough to fit under the baseboards. With this extension, I was able to run the entire length under the window, so any leak would be spotted immediately. The only negative is the price, I think it should be at least half what I paid. But it works and does a great job so I'm only deducting 1 star for the price.
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