After the first week of having them installed, we had heavy rain and I found out the sump pump went out. The sensor by the sump pump was the first to issue an emergency alert followed by my water heater. Both on the permitter of the basement where water was beginning to over flow from. Thanks to this sensor, I was able to identify the sump pump float was stuck which caused the failure. These sensors saved thousands of dollars of damage since I do not go into the basement often.
The three copper contacts detect water and there is a temperature and motion sensor too. You can use the app for the product to set up how loud these go and if it's tampered with (moved around). My cats moved them for a couple days and then left them alone. The sensors show up in the Apple Home app at the top showing room temp. From there, you can follow the settings in the home app to take you to the Fibaro app should you need to change any settings. These do not show up as items that have tiles, but they are at the top of the assigned room.
These are very much worth the money and after one year, the battery is still reporting 100%. They come with a very good 123 battery. Remember to remove the paper from the battery when you first get them.
Setup was a breeze. Use the Fibaro app to set them up and the connection to the Apple home app is simple. Scan the code and assign them to a room. Give them a unique name and you are set.
Absolute GEMS. A must have device. I do test mine monthly after the sump pump stopped working shortly after getting these set up last year. Simply use a wet paper towel and set the puck on it. It's that easy and everyone in your home app (added users or family) all get the urgent alert. It's more than awesome and for $50, you cannot go wrong. Put them in all your rooms where you have a sink or are concerned about leaks.