This is the Skylark Contour CL Dimmer, ideal for CFL and LED dimmable bulbs. It features On / Off rocker switch with a captive linear-slide dimmer for a standard designer wallplate opening. It has HED Technology: Lutrons advanced dimming circuitry designed for compatibility with most high efficacy light bulbs It is also UL Listed to control dimmable compact fluorescent (CFL) with integrated ballast and dimmable LED with integrated driver.