These are super. I will catch and release bees, stink bugs and most any other bug that happens to appear in my home. However, I will not, I repeat, will not tolerate flies. These bug zappers are a personal way for me to accomplish that nasty task of smashing flies on surfaces that I then have to disenfect! I believe that they are the dirtiest, disease spreading, ugly bug there is. Now I do not have to spend time chasing them. I just stand in the middle of the room and wait for them to fly by and be zapped! Fabulous!