I have two of the Stinger Ultra units. At night, I keep one in the kitchen downstairs and one up stairs in the loft area. This arrangement has worked great for 2-years killing the bugs that get in the house. It gets large and small moths, flys, mossquitos, knats, fruit flys and other flying pests. One of my lamps has just gone out after 2-years and the other unit is still operating well. Our experience for "inside" use has been a winner.Get more detail about Stinger Ultra Bug Zapper.