The GROHE Sense Water Sensor is a small puck-like device in premium design that can be installed inconspicuously in any room. When water accumulates, it not only sounds beeps and flashes red, but also sends you alerts through an app so you can eliminate leaks that would otherwise cause significant harm to your home. If you install the GROHE Sense together with the GROHE Sense Guard System, you can also shut off the water supply remotely or even automatically.