Draws flying insects with an irresistible combination of natural attractants, including pheromones, decoy flies, and UV light. Innovative cartridge system traps up to 10 times more flies than glue boards. Audible alarm alerts when cartridge needs replacing. Insect Inn Ultra I is a discreet, decorative unit for use in public areas and has a coverage area of up to 2,500 sq. ft. FYI: Meets all applicable USDA and FDA guidelines. 120V.