Preset dimmer with large switch, slides up to brighten and down to dim. Slider button turns lights on and off. Nova dimmers are the contractor's choice in rugged, linear slide dimmers. It is suitable for demanding applications up to 2000 Watts. Heavy-duty components for surge protection and long product life. It features voltage compensation, power failure memory, superior RFI suppression. Lutron controls are rated at 120Vac, 60 Hz unless otherwise noted. It has over 25 years of proven reliability. Full family of product are suitable for all lighting sources.