Anti-collision bird stickers decal prevent birds and people strikes. Full UV Reflective Coverage: Every decals is fully covered with UV reflective material that can reflect ultraviolet light. While humans see only the regular colors of the decals, birds can perceive the glowing warning signal, helping them recognize glass surfaces and avoid dangerous collisions. Made of PVC, doing a good job of keeping your furry flying friends from crashing into the picture windows! Reduce your feathered friends accidents and prevents breakage. Easy to install, post to the window/door. Peel it off, stick it on, done! We recommend to put decals to outside of the window, but in case, if can not reach the dangerous outside of window, you can stick it inside, the effect may be influence a bit. Bird-Friendly Design: It is a long-lasting transparent static decal that fit for smooth surface glass doors and windows, reduce your feathered friends accidents and prevents breakage.