Check the listing for details. Multi-Purpose 12V DC Rain Water Flood Prevention Sensor VDC Output Module. Condition: New. Listed at 29.66 USD. MANUAL Rain or flooding sensor capable of activating its output in the presence of water or conductive liquids. A single circuit, a thousand uses! Very useful in the home for detecting water leaks to report to external devices such as alarms or home automation systems. It can also be used as a rain sensor to automatically close shutters, windows, curtains or disable irrigation systems. And again, it can be used as a humidity detector for plants and gardens, allowing a control system or irrigation system to know when the soil is dry and needs water. Can also be used as a touch switch to activate electrical loads! After the great success of the first version, our water presence sensor is updated and introduces new features, better performance, flexibility and greater compactness. IMPROVEMENT.