This clever switch does exactly what it's said to do and has an extra feature... if it shuts itself off in vacancy mode (vacancy mode = manual on, automatic off), but someone is actually still in the space, it can be reactivated by detecting motion within 30 seconds of shutting off. This is cool for those family members who get annoyed when your technology leaves them in the dark while they're trying to take a shower (oops). Why did i give it 4 stars instead of 5? I have only one gripe, but it happens to nullify the purpose for the switch. I noticed none of these cool "green" devices specify the idle current draw. That is; how much power it's consuming while the lights are off. This may seem like a trivial piece of information until you examine the details, so I tested all of my hardwired z-wave devices and also tested these switches. Here are some results: Aeon Labs micro switch: 13 mA Aeon Labs plug adapter: 15 mA GE Smart Switch: 16 mA GE Smart Dimmer: 19 mA TopGreeener TDOS5 (this switch): 37 mA (hmm... it would seem I've outed myself as slightly OCD at this point) Now, instead of converting everything to power/energy and talking about the estimated cost to power the idle switch, I'll just make a few comparisons based solely on current draw (all devices share the same voltage and $/kWh, so this will be apples to apples). Lets say you have a few spaces in your house that don't get used very often, but you want to avoid the possibility of the light getting left on for days just because no one goes in to check on it (e.g. the utility closet, attic light, basement light, etc.). One might think this is the perfect solution, a switch that will turn itself off! The problem is: a 40W LED bulb takes ~72mA and this switch takes 37mA when the light is OFF! that means installing this switch will become the equivalent of leaving the light ON 12 hours a day, every day! This is worth restating; even if you NEVER turn the lights on, this switch will consume just as much power as if you left the light ON for half of every day, or 4,380 hours per year. So, if you would have only used the light for a few hours per month, installing this switch will drastically increase that circuits energy consumption. It's equally counter productive for things like bathroom fans. If you have a few bathrooms and want to keep fans from running unnecessarily long, this switch would, again, seem like a convenient solution. Well... I measured my vent fan and it draws about 650 mA. So, in a 24 hour period, this switch will consume about 30% more energy than the fan would if it were left ON for an hour. That means any fan that is typically used for less than an hour per day will be better off without the constant load of this switch. Installing the switch in these applications will drastically increase your overall energy usage. As bad as all of that sounds, there are cases where this switch would save energy like a champ. For example: 1. A room with several incandescent lights that consume large amounts of energy very quickly 2. A room with several LED lights that get used frequently (i.e. a bathroom vanity with 4 or 6 bulbs) In these cases, the energy saved by reducing the ON time will add up very quickly and the energy spent on idle current will become insignificant. Unfortunately, this switch can will only provide value to me in about 3 of the 12 applications I intended. (i.e. counter productive for the guest closet, guest bathroom, all bathroom fans, utility closet, basement sump closet, attic, etc). The moral of the story is that you have to consider all of the elements of your "green" efforts to avoid unintended wasting of cash and energy. In several applications, a $3 toggle switch will ultimately prove more energy efficient than the more expensive, automated options.