Note: - Please don't connect electricity until all installation steps are completed. - Please confirm if your light bulb is dimmable, and the power is within the appropriate range. Timing function can be timed to turn off the lights after 2 hours, 4 hours, and 8 hours.Three preset time buttons, press "Timer Button" to turn on 2H/4H/8H and automatically turns off when time expires. Dimming Range: LED Max.25W; Incandescent Lamp Max.100W; Halogen Lamp Max.100W.The line with printing is the Positive pole(Live line) ,No printing line is the Negative pole(Zero line) . Timed dimmer switch suitable for LED lamp, incandescent bulbs, halogen lamps, table lamps, and other bulbs. Full line length is 1.8 meters (5.9ft),4 Key button control, safe to use and easy to operate. Note:Please confirm if your light bulb is dimmable, and the power is within the appropriate range.