Catch leaks as soon as they start with a water-sensor system that triggers X10-connected lamps to flash. The X10 Water/Moisture Sensor can detect moisture on any non-conductive surface and send a signal to any X10 receiver in range via an X10 Powerflash module (sold separately). The X10 Water/Moisture Sensor connects to the Powerflash module via two leads on a 5-foot cable. Place the sensor so that the two probes touch the surface to be protected using the included self-adhesive wire tie and holder to position the sensor in your desired location. When the X10 Water/Moisture Sensor detects moisture on the surface it's monitoring, the Powerflash module will set one of three events in motion, as determined by the user: 1) All lamp modules (sold separately) set to the same house code as the Powerflash will turn on, and all appliance modules (sold separately) set to the same house and unit code as the Powerflash will turn on. Appliance modules will turn off when the moisture is removed, lamp modules will stay on. 2) All lamp modules set to the same house code as the Powerflash will flash. All will remain on when moisture is removed. 3) All lamp and appliance modules set to the same house and unit code as the interface will turn on. All will turn off when moisture is removed.