Bird’s eyes see much more than human eyes. They have up to 12 times the number of photoreceptive cells in their eyes & can see a much wider spectrum of color. Window Alert decals take advantage of this difference and help prevent bird window collisions while not obscuring your view. These decals brilliantly reflect ultraviolet sunlight. The result is a product only slightly detectable by humans but easily seen by the birds more sensitive eye. Thus, the Window Alert decals help prevent birds from flying into windows while remaining almost undetectable to the human eye. 4 Different Designs: Hummingbirds, Maple Leaves, Hawks, Butterflies
