It utilizes our innovative suction cups to mount to any window. The cardboard surface can be used for basking in the sun or to groom cat claws. Comes with a free bag of catnip. Refill pads available. One year limited warranty - excludes the cardboard scratcher and refill pad Mounts to any glass surface Large surface is great for scratching or basking in the sun A true entertainment center for your kitty Free catnip included