Outus 32 Pieces Leaf Window Strike Prevention Stickers Bird Deterrent Decals anti Collision Window Clings Hummingbird Butterfly Leaf Shapes Static Stickers Prevent Bird Strikes on Glass. How to operate: first, clean the window with a duster; Second, spray a mist of water on the glass, then peel the anti collision window cling from the vinyl backing and place it on the window in any design you like; If you want to rearrange it, simply peel it off and move it around, easy to operate and will give you good using experience.