Replaces a standard switch. Provides smooth, full range digital dimming for incandescent, halogen, electronic low-voltage, magnetic low-voltage, dimmable LED/CFL and Fluorescent lighting. 300 W dimmable LED/CF, 600 W Incan/dimmable ELV/halogen/dimmable FLR 600 VA MLV, 120 VAC, 60 Hz requires neutral connection in wallbox. Ability to set min/max dimmer level for maximum compatibility with different loads. Rapid start feature which allows the light to come on instantly in the case of LED/CFL loads and the ability to disable that feature. One master dimmer works with up to five (5) accessory dimmers, Orgill Sku 339-6181. Tri-color packaging which provides one unit box with three color faceplates. cULus Listed and NOM certified.