Technical advantages: 220 ~ 240 VAC 3-100 W online final phase dimmer, the dimming process is completely silent and there will be no beep! The minimum brightness can be preset and the dimming range is 0-100%. HIGH QUALITY: The LED rotary dimmer has overload, overcurrent and overheat protection functions and is compliant with CE and ROHS safety standards. Eye protection: turn off the light from 0% to 100%, let the eyes gradually adapt to light or darkness; reduce the amount of glasses worn to protect eyes from damage caused by too bright light. Energy efficient: works with dimmable LED bulbs up to 50W or incandescent/halogen bulbs 100W, 0-100% dimming range reduces energy costs and extends bulb life. Note: Before purchasing, please confirm whether your LED light is marked like DIMMABLE. Otherwise, you cannot use this dimmer to dim, only to turn lights or lamps on/off. Cannot be used to control the speed of inductors and fans. The LED dimmer complies with UKCA and CE standards! For lighting and controlling incandescent lamps, dimmable LED lamps, high voltage halogen lamps and halogen lamps with electronic transformers. It cannot be used to control the speed of transformers, fans and induction motors. Turn the control knob clockwise: the light intensifies until it reaches maximum brightness. Turn the control button counterclockwise: the light dims.