I didn't know that I had so many gnats (and perhaps other tiny flies?) in the master bathroom and my office. All I knew is that it seemed that there was something that was doing a "drive-by-bite", and it was so fast that I could never see it, hence I could never catch it. I recently killed a couple of gnats in the master bath, something I hadn't seen in the first 2 years we first purchased this home, so I feel like this problem is new.I started looking into how to fix the situation, and I knew right away that I was not interested in creating a whole bunch of contraptions of apple cider vinegar with sweeteners, etc, to catch these. I didn't want jars of liquid all over my house. So, as usual, I knew someone on Amazon had figured out an easier way, and here we are!Now, I definitely need to figure out the root cause, but in the meantime, the solution offered by the Safer Home gnat/fly trap is fantastic. At first, it seemed to be slow going, but within a half hour, one gnat was already on the card. I thought, well, that was probably the one who had been continuously biting my feet and legs! Later, I saw another stuck on the card and then didn't see much action for a couple of days. Days later there were a couple more...and more! I was thinking, yes, yes, invite all of your friends and family! And it seems that they did. Within 2 weeks or so, the card was nearly covered!Occasionally, I will turn on the light in the bath and find one or two crawling along the edge, or dancing behind the card, and then it jumps on the card and back off. It's fascinating! If one is running along the edge, I will help him meet his fate sooner, and if not, he will eventually stick to the card with everyone else.What I do notice though is that in the afternoon one gnat (or two?) wanders into the office where I am working after I've closed the light-blocking curtains to block the heat and sun. (I guess they are drawn in by the lamp?) So, now I am wondering if I should put another Safer Home trap right on my desk, or by my legs because all of the drive-by-biting makes it difficult to concentrate on what I'm working on.For anyone who says "it didn't work" may need a bit more patience, or they have too much light in the place where the night light is placed. I placed mine in the master bath, and it's pretty dark in there, but there's no door to the main portion of the bath (only where the toilet is). I thought that the light from the gigantic sliding glass windows in the office would affect how the product worked, but it hasn't. In other words, too much light coming in from elsewhere wouldn't draw the gnats to the UV light in the bath, but this must not be the case for my master bath.I am so thankful for this product, and I recommend it!P.S. I have attached 2 pictures of what the trap looks like in the master bath with a bit of light filtering in from the big windows in the office. It seems that if you can get your space at least this dark, this product will do wonders for your space - and your ability to concentrate while working!!