WindowAlert decals help prevent wild birds from accidentally striking windows. Each decal has a special coating that reflects ultraviolet sunlight. This 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 centre then work out, placing decals at a minimum, on every 2 feet of glass. For maximum protection, scientific studies suggest placing decals 2 inches (5cm) horizontal, by 4 inches (10cm) vertical, from one another. WindowAlert decals have been tested in flight tunnels by the American Bird Conservancy. More decals equal more protection. For optimal results, we recommend the 4"x2” rule promoted by the American Bird Conservancy.
UV coating will fade based on exposure and to the elements and local elevation.
CONTENTS: 14 Decals per Envelope. Each decal is approximately 2.5 inches across. TYPE: Static cling.