The toro wired rain sensor saves water and money by automatically interrupting your irrigation system when it rains. It works by absorbing rainwater and then responds by interrupting power to the valves. The rain sensor will then gradually dry out, as does the soil, allowing sprinklers to run as scheduledHighlights:Compatible with most automatic timersAdjust the rain sensitivity from 1/8" to 1"Requires wiring between the sensor and the controllerQuick-Clip gutter bracket for one-piece, tool free mountingSensor uses industry standard hygroscopic discs to sense rainOperating temperature from -20 degrees to 140 degrees saves water and moneyWater conservation device that meets legislative standards instates/ municipalities with mandates25'' of UL rated connection wire included• Clamshell