Blackout Blind on a roll that clings with static to any window and blocks out 100% of the light. Ideal temporary blackout blind can help families stay asleep longer. No mounting hardware or adhesive needed to secure the sheets to the window. Can be taken down and put back up without leaving any residue behind. Great for nurseries, night shift workers, hotel rooms, vacations, photography, movie and computer rooms - anywhere you want to block out the light. this is a STATIC cling product, it is recommended to lightly spray surface with water mist.