The TOPGREENER TGT08-4 is a countdown timer switch that replaces standard wall switches to control lights, fans, or other loads on a preset time delay. There are eight timer options to choose from, 1, 5, 10, 30, 45 min, 1, 2, 4 hours. Save energy and have peace of mind knowing that unused lights will always shut off. A blue LED indicator is conveniently located next to each button and lights up when a time is selected. It is also great for locating in the dark. Set it and forget it with this countdown timer switch! To operate the timer light switch, simply select the desired time delay, and the switch will automatically turn the lights off after the selected time is up. This timer switch is ideal in a variety of applications, from bathroom fan control or garage light control. Use the TGT08-4 to control the bathroom fan and clear out moisture after a shower. Or use it for the garage, where the lights are easily forgotten. This timer switch works with most types of light bulbs, including LED and CFL light bulbs. For single-pole use only. A neutral wire is required for the switch to work properly.