The solar SYNC et Sensor is an advanced weather Sensor that calculates evapotranspiration (et) & adjusts hunter controllers daily based on local weather conditions. Solar SYNC measures sunlight & temperature, & uses et to determine the correct seasonal adjustment percentage value to send to the controller. The controller then uses its programmed run time & adjusts to solar syncs seasonal adjustment value to modify the actual irrigation run time for that day. In addition, the solar SYNC et Sensor integrates hunters popular rain-click & freeze-click Sensors providing quick response in shutting down your irrigation system during rain &/or freezing conditions. The solar SYNC is compatible with most hunter controllers & applicable to residences, businesses, & municipalities alike.