The ETL listed Titan Controls Mercury 2 is a fully Adjust-A-Wingble fan speed controller used to ventilate your garden. The innovative 'fire-up' feature provides full power for your fan upon start up and then slows to the required fan speed setting on the dial. This extends the life of the fan by properly controlling the electrical load. The Mercury 2 is ideal for use in commercial settings. One dial operation makes it easy to use. 6 Amps/120 Volts/60 Hz. 3 year warranty included.