Hummingbird WindowAlert Decals

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Help prevent wild birds from accidentally striking windows with these Hummingbird shaped WindowAlert decals. Each decal has a special coating that reflects ultraviolet sunlight. Th is ultraviolet light is invisible to humans, but birds see it as a brilliant glow much like a stoplight. Place decals on the outside of the window. Concentrate decals at center then work out, placing decals at a minimum, on every 2 feet of glass. For maximum protection, scienti­fic studies suggest placing decals 2 inches horizontal, by 4 inches vertical, from one another. UV coating will fade based on exposure and local elevation. For best results, replace decals every 4 months or test with the WindowAlert UV Flashlight. Show more