Can't say enough good about this unit. I did a LOT of research before buying one and have to say i'm very happy with this choice. It make a big difference on our back porch so long as you follow the directions. You want it mounted AWAY from where you're relaxing so it attracts the insects away from you. This thing zapps them non-stop. Sometimes we just sit on the back porch and laugh at zap after zap. :)