IllumaTech preset dimmers and fan speed controls feature a low profile fluid slide bar movement for fine adjustment of light levels or fan speeds that's accompanied by an easy-to-use on/off preset switch. the switch provides quick on/off control without disturbing your favorite pre-selected settings. most feature a built-in led locator light, as well. models are available for incandescent, magnetic or electronic low voltage, and Mark 10 Powerline dimming-ballast fluorescent lighting, and quiet and standard fan speed control. all preset models are designed for both single-pole (one location) and 3-way (multi-location) applications.