This is a professionally printed window cling decal made to resemble the signs found on the perimeter of the Groom Lake base measures approx. 5" x 3.25". It is intended to be applied to the inside of your home or car window and be seen from the outside. WARNING In case I have not mentioned this, this is not a REAL military decal. It is only a prop decal made to look authentic. If you apply this decal on your car and try to enter any official military base they will shoot first, they have no sense of humor. You have been warned. How to apply Cling decals. This decal will adhere to any clean and dry surface. Images are reversed-printed. Peel the paper backing and apply to the inside of your window. Do not block your view. Decals are best applied in temperatures of 65 degrees and over. Decals can be removed and re-applied.