This zapper is fabulous, of quality construction.  I had a terrible moth problem at my back door.  The moths were attracted to the outside, back-door light.  When I opened the door to let the dogs out, swarms of moths would fly into the house. I could not just turn the light off because it is dark as a cave and spooky back there.  I placed the zapper about 25 feet away per instructions.  This zapper lures the moths and zaps them.  I now keep my regular back-door light on, and the moths are not interested anymore.  They go directly to the zapper.  This excellent product has wide grid openings so the bugs can easily get in.  The numerous electric zappers inside are vertical so the dead bugs fall off easily.  A little bit of wind takes care of blowing the dead bugs out.  I am ordering another one for my front door area !!