This is a great countdown timer switch. I have this what the manufacturer calls "Hour Timer" for my garden deck light and the "Minute Timer" for my bathroom fan. I also have two of the cheaper Woods timer in the house. If the $10 difference is no big deal for you, go for this one - it is much better to operate and looks better.It is a single-pole switch, meaning it will not work in a setup with two switches (like in a hallway). To my knowledge there is only one timer product on the market that is 3-Way (2 or more switches for one light), which is the Lutron MA-T51MN-WH.For installation, you will not need a neutral (white cable) and I think the product even works without ground (green or blank) cable but I would not install it this way (security issue). It comes with all the screws you need for installation but of course not with a face plate (cover).You can turn this into a different timer switch after the fact. Just press the power button and the 1 Hr button at the same time for a few seconds until they both start to blink, then you press one of the following once:1 Hr button = 1, 2, 4, 8, 12 hours2 Hr button = 1, 3, 6, 9, 12 hours4 Hr button = 2, 4, 8, 12, 24 hours8 Hr button = 30m, 1, 2, 4, 8 hours12 Hr button = 15m, 30m, 1, 2, 4 hours.So in other words, you can change the shutoff times later. Of course, you would have to put stickers over the old buttons or just deal with it reading the wrong values.Besides that you can put into indefinite "on" mode by pressing the power button for 2 seconds, and of course you can shut it off any time with the power button.Yep, all in all a neat countdown timer switch that I enjoy having in the house.