For control of lighting levels which can be raised or lowered through 10 incremental steps. Or switches between On and Off with two selectable modes: remember previous light level, or switch to maximum light level Panel mount or can be located inside junction Use with 3 or 4 wire connection "Soft" on and off transitions Supply voltage: 230Vac Suitable for incandescent or halogen lamp loads of 400W Dimensions: W50mm x H50mm x D22mm