Usage Tips:Fangrui Product Details Technical Advantage: 220~240vac 3-100w Inline Trailing Edge Phase-cut Dimmer, The Dimming Process Is Completely Silent And Will Not Make A Buzzing Sound! The Lowest Brightness Can Be Preset, And The Dimming Range Is 0-. : Quality With Overload Protection, Over Current Protection, Over Temperature Protection. Eyes Protection: The Lights - To Let Your Eyes Gradually Adapt To Bright Light Or Darkness; Reduce Eyestrain And Protect Your Eyes From Overly Bright Lights. Energy Savings: Works With Max 50 Of Dimmable Led Bulbs Or 100 Of Incandescent/halogen Bulbs, Dimming Range 0 - To Cut Energy Costs And Extend Bulb Life. Note: Purchasing, Confirm Whether Your Led Light Is Marked As "dimmable". If It Is Not, You Cannot Use This Dimmer For Dimming, You Can Only Turn On/off The Lamp Or The Lamp Flickers. Cannot Be Used For Speed Control Of Inductor And Fans. Colour: Black Material: Plastic Package Contents: 1 X Dimmer Switch Only The Above Package Content, Other Products Are Not Included. Note: Light And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.