I bought this sensor to mount under my washing machine as Smartthings have stopped selling their version of the water sensor. It's a lot smaller than I expected (I didn't check the dimensions) but it fits under my washing machine easily. It took less than a minute to set up the Smartthings app and test it with a plate of water - it sent an instant notification to my phone. I'm not sure how long the batteries will last, but as mentioned, it requires AAAA batteries, which are hard to find in stores.
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