Automatically slows down or speeds up centrifugal fans to respect user selected temperature setpoints. Enables the user to select the minimum fan speed (Idle Speed) between 25% and 60% of full power in 5% steps. Enables the user to activate/deactivate the Low Temperature Emergency Stop during the day only, during the night only or at all times. 6 foot cord with temperature sensor precise to 2F/1C. Can drive single phase 120 Vac induction motor type fans up to 750 Watts. Any forced ventilation rooms should be equipped with this type of control to promote faster and more vigorous growth. 3 year warranty.