For several years, I have been trying to get my 13 year old daughter to run the fan in the bathroom during certain tasks (i.e. shower, bath, uh and you-know-what). For some reason, the neurons that should help her remember to turn on the fan have repeatedly failed to fire. As a result, I decided to add a humidity sensor to the fan so that it would come on automatically. Well, after much research, I determined that humidity sensors were way too unreliable to be used effectively...plus they can't detect methane. My final determination and the ultimate solution to my dilemma was to wire the fans electrical wires directly to the light switch (please use a licensed electrician - as I did - to do this work). Now, when the light is turned on, the fan comes on too. My daughter was a bit perplexed at this, at first, and it took some getting used to. Now, humidity and many other things are controlled and nobody has to give it a second thought. The switch plate looks good, keeps out moisture and is made of a Bakelite type material. The first unit I received was cracked but the seller, immediately shipped out a replacement which was packed MUCH BETTER than the first. Product and seller are both winners here. I certainly recommend this product to anyone wanting to combine two switches into one and covering that second switch blank. Oh...just go ahead and try to find one of these things at your local hardware store; probably not going to happen. Save yourself the gas and get it from Amazon.com.