Flying insects are attracted to the ultraviolet lights and are captured on a replaceable adhesive board. This unit will cover 900 square feet. This attractive white wall sconce unit is 24 inches in length and 10 inches wide and 5 inches deep. This insect control silent trap is a good choice for office spaces, foyers, restaurants. This particular unit also comes in a gold color, see item WS-85G. Mount it at least 5 feet above the floor for optimal coverage.