This is a sensor that is placed under the cabinet where the water heater and air conditioner are located. It rises above the panel with ventilation holes under the door. We had a water leak that caused some of the hardwood floors to warp and needed replacing. We placed these four sensors under the raised floor in places where we knew water would collect. I'm guessing we won't know how well they perform for two years or until we have a water leak, so I can't really rate them. It would be helpful if the box said there were instructions inside the box. It comes in sealed packaging with very little information. The instructions in it said that when the alarm goes off, all you have to do is remove the bottom foam cover.
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