The Cooper Wiring Devices RI306PL-V-K 600-Watt 120-Volt Lighted Incandescent/Halogen Rotary Dimmer with Preset replaces a standard switch and offers dimmer capabilities. It features an integrated rotary dial for on/off and dim/bright functions with a locator light. With the 3-way set up, you can control one light from multiple locations when unused in conjunction with a standard switch. This devices uses square law dimming, this means that the perceived dimming level is proportionate to the rotary position. With its preset feature, you are able to return to its most previous setting when you turn the light on. Some other features include Radio Frequency Interference filtering for radio, audio, and video equipment, electrostatic discharge protection, and also power failure memory. The Cooper Wiring Devices RI306PL-V-K 600-Watt 120-Volt Lighted Incandescent/Halogen Rotary Dimmer with Preset is compatible with any traditional switch wall plate or screw less wall plate. Cooper Wiring Devices is committed to providing products that increase productivity, energy efficiency, safety at work and in the home, and produce reliable performance. Whether a home"s style is traditional, modern, casual, cozy or rustic, it will demand more from wiring devices than in years past. Cooper Wiring Devices is dedicated to providing the up-to-date wiring device solutions that today"s homes need.