Be sure to install it in the proper location. For instance, I see a lot of them on the corner of a deck...that's the wrong place. The idea is to place it away from where you will be sitting....so if you are worried about a deck, then place it away from it or else you are just attracting them where you will be hanging around. Others will place them so that the direct path to the zapper takes them across the deck as well. Anyhow, you probably get the picture.