Raid Window Fly Traps will attract, trap and hold flies and many other flying insects. Ideal product for any room where you want to control flying insects without using an insecticide. Raid Window Fly Traps are odorless and transparent (almost invisible). They do not mark windows and they are easy to use. Flying insects are attracted to windows by light and heat. Insects are soon attracted, trapped and held by the Raid Window Fly Trap! Use on any window, in any room, to control flying insects.