The Ortho Home Defense Fly Bait Decal For Windows can be used on windows, in pantries, food storage areas, on walls, or any flat surfaces where flies congregate. Flies are attracted to the coating on the sticker and start to die within 60 seconds of contact. Flies do not stick to the surface and will drop to the floor or nearest surface. One sticker per 1000 cubic feet is recommended. For rooms with high infestations, place a sticker in each window.