The Single Dimmer Switch, Haze is a single dimmer plate in Haze, a pale whisper blue, with 3 knob shapes (Dot, Dip, Mum) and knob colours Moss, Roma, Carmine. Dimwit dimmers are made for 120V North American electrical systems, are single-pole only and work with most dimmable LED, CFL, incandescent and halogen bulbs.