Plastic shell, smooth without burrs, serviceable. Embedded power line switch, inline switch, single line control dimming, easy to use. Minimum brightness preset function, dimming range can be customized to a certain percentage through simple steps. Easy to install. Just cut the wire where the switch needs to be installed, and then install the wire into the terminal and tighten it. Suitable for dimmable LED bulbs, incandescent bulbs, halogen lamps, table lamps, floor lamps and other bulbs. Adjustable optical power range: LED bulb: 2W - 25W; CFL bulb: 2W - 25W; Incandescent/Halogen bulb: 5W - 80W. Smooth dimming without flicker, with overheating protection function, safe to use. Switch knob dimming function, 0- full brightness adjustment range dimming. Dimmable LED Range: 2W - 25W Dimmable CFL Range: 2W - 25W Incandescent/Halogen Bulb Range: 5W - 80W Characteristics: Full Range Dimming Product Name: LED Dimmer Switch Voltage: 220V Colour:Black Material:plastic Package Contents: 2 x LED Dimmer Switch Only the above package content, other products are not included. Note: Light reflection 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.