Hydro-Rain’s HRC 100 hardwire sensor is designed to save water and limit damage to foliage by turning off sprinkler systems during rainy or freezing weather. A must have for every sprinkler system the HRC 100 is easy to install and will provide years of reliable, accurate performance. Constructed of heavy-duty, UV-protected ABS, aluminum mounting bracket, and heavy-jacketed copper wire, the HRS 100 is the right choice for your sprinkler system. No other major brand in the industry makes the thermostat feature standard on every hardwire rain sensor.