I just installed the seventh one of these Astronomic timers at my niece's home a few days ago, which completed a new driveway lamp fixture and wiring project I did for her on her garage. The original lamp setup that existed on her garage looked as if an untrained chimpanzee had installed the lamp. Well, that's demeaning toward chimps, so I apologize for that. An untrained chimpanzee could have done a better job of the work I found. Anyway, new lamp fixture for the driveway, appropriate and correct wiring, outlet boxes and installation to make everything work. The only missing element was a way to control the new installation. The old setup didn't use any type of switch, as it used a motion-sensor, which my niece and I agreed it needed to go. Temporarily, I installed a standard light switch so she'd have a driveway light at night, until the new Intermatic Astronomic timer arrived and I could install it. As I said earlier, this was the seventh one of these switches I've installed. My mother-in-law's home got three, my own home has three, and this one went in to control my niece's new driveway light fixture. She wasn't sure about using this in place of the motion-sensor when I suggested it, but now she's sold. These timer's are great for a number of reasons. Do you have a light that uses an in-wall switch that you'd like to use a timer to control it? With most in-wall timers you need to make sure you have a "neutral" wire in the switch box because without one the timer won't be able to "run", meaning it won't follow any program; without a neutral wire to complete the circuit most in-wall timers won't work. These will! They can do the job without need of a neutral wire because the timer itself uses a lithium battery that fits into the switch body, allowing it to control the power to your "load" (light, motor, appliance, etc.). So any circuit that simply works by installing a switch in the "line" ("hot", black wire) these timers will do the job. That's one of the perks of these. Another is they have very flexible programing, much more than can be described here, but very well explained in the included instruction sheet. My favorite perk though, is the fact that you can opt to use the "Astronomic" setting to control your circuit. This means that if you use these timers to control, say outdoor lighting, the Astronomic program will turn the lights on at dusk and off at sunrise and it will do so following the change in hours of daylight throughout the year! No more having to reset the internal programing to allow for seasonal light changes, and no more bumping it for daylight savings! Like I said, these timer switches are really useful and excellent in how they perform. Highly recommended!