WindowAlert Butterfly UV Decal is designed to help prevent wild birds from accidentally flying into your windows. This innovative decal features a special coating that reflects ultraviolet sunlight, which is invisible to humans but appears as a bright glow to birds, similar to a stoplight signal. To use, simply place the decal on the outside of your window, starting from the center and working outward. It is to position decals at least every 2 feet across the glass, with scientific studies suggesting spacing them 2 inches horizontally and 4 inches vertically for optimal protection. This easy-to-apply solution effectively reduces bird collisions while maintaining clear visibility for you. Model Number: