The Irrometer WaterSwitch is an add-on product for Rain Bird (and other manufacturers) controllers that works with existing valves or controllers to improve irrigation efficiency based on plant demand. The module will prevent irrigation cycles by signaling the controller’s sensor circuit or interrupting the solenoid power, when the soil moisture status is wetter than the adjustable set point. The kit includes one or two moisture sensors and has nine moisture set points allowing for a wide range of variation in plant and soil type. An indicator light flashes to show status.