The Extra Sensor adds greater water detection protection when used with the Washing Machine Valve Shutoff Kit (sold separately). Never come home to a flooded house again! The Washing Machine Valve Shutoff Kit is a revolutionary safety system that averts costly damage stemming from your washing machine, a common source of ruptured hoses, connection seepage and other water-related catastrophes. The very moment the system detects a leak, it will automatically respond by stopping the water source and making the washing machine shut off before the real damage starts. The Extra Water Sensor comes with 1m patch cable. Once you have installed the Washing Machine Valve Shutoff Kit, place the extra water sensors on the floor, and rest easy with your increased water detection protection. That's it! No more flooding. No more costly repairs. And no more worries! The Washing Machine Valve Shutoff Kit, which is sold separately, includes one water sensor. You can add as many extra water sensors as needed. This water sensor provides a dry contact closure. The Washing Machine Valve Shutoff Kit also protects against water heater or ice-maker leaks. Want the same protection on your gas water heater or refrigerator ice machine? Then check out our Water Heater Auto Shutoff Compression Kit and Icemaker/Water Filter Valve Shutoff Kit, each sold separately