I have been using these sensors for several years now. I think they work great as long as you make sure the battery isn't dead. I also had a Leaksmart valve in my last apartment. It's not in my new house yet. Now I have three. They are located next to my kettle, dishwasher and washing machine. Since I don't have Valve, I set up some notifications in Wink. Any sensor that detects water will turn all my smart RGBW bulbs red and send me text messages. That works great. I recommend testing the sensor monthly with water or simply attaching the contacts with a paper clip.
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