The water detector works so far reliable and already when wetted a cloth at the sink and the water detector turns off it. Installation is not necessary. The detector is exhausted and it needs only a battery that comes with also.
Caution for those who want to be warned not only against water damage by pipe breakage and damage to the machine, but also intrusion of rainwater or sewage water (z. B. by backpressure). The water detector can detect only pure, clear water. Rainwater, which has a different conductivity, is not recognized, even if the water detector already "knee deep" floating in the water. Therefore, do not buy if storm damage to be detected!