the description states they will cling to the window although i wish they were just a little bit smaller five stars five stars it is nice to know that this could save the life of five stars the decal is backwards and works for display on the pet alert for safety no longer on the window after 1 week it must have i ended up throwing them in the garbage good for my kitty the only negative thing i have to say about this great safety measure great value for outside ask vet if they sell or give them away