These window decals help prevent bird strikes by making glass surfaces more visible to birds, reducing the risk of collisions with slider glass doors. They are self-adhesive, easy to apply and remove, with no residue. Can be used on either the inside or outside of windows. The holographic design reflects light, creating a visual deterrent that helps birds detect windows and avoid flying into them. Rainbow window clings are static clings. Clean the window surface, peel off the backing film, and place the clings on the glass as desired. For best results, apply to the outside. Before installation, ensure the surface is clean, dry, and free of tint, film, coating, or other obstructions. The decals can be removed temporarily for window cleaning and reinstalled afterward without losing effectiveness.