We have had the Dynatrap for 4 years and it works great for us. Moths are one of our huge problems and the Dynatrap cuts down on the number of moths significantly. It also reduces the number of mosquitos so we love the product and use it regularly. We have ours outdoors without any covering over it and it doesn't seem to be affected by the rain. We here in the Southwest don't have tremendous rain storms so perhaps where it rains a lot, the Dynatrap may need a covering.Dynatrap DT1000 Electronic Insect Eliminator - Half Acre Coverage