Protect our feathered friends with WindowAlert Decals – an innovative solution designed to prevent wild birds from accidental window strikes. Each decal features a special coating that reflects ultraviolet sunlight creating a brilliant glow visible to birds while remaining invisible to humans. Key Features: UV Reflective Coating: The specialized UV coating ensures that birds see a brilliant glow akin to a stoplight making the decals a powerful visual deterrent. Easy application: Place on the outside of the window. Optimal placement: Scientific studies recommend positioning decals 4 inches horizontally and 2 inches vertically from each other. Versatile and Repositionable: The static cling feature allows you to customize placement without any sticky residue. Contents: 4 Decals per Envelope each approximately 3.5 inches across. Type: Static cling. Made in the USA. Create a bird-friendly environment effortlessly with WindowAlert Decals – where protection meets beauty and versatility. 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. (If a single bird repeatedly attacks your windows please use our Stop Bird Attack product.)