The patent pending K&H Kitty Sill - EZ Window Mount is the easiest, strongest, most versatile window sleeper on the market. We’ve incorporated 2 push' n 'turn suction cups and 2 giant push cups for the ultimate in strength. These things suck! Really! Each suction cup holds in excess of 100 lbs. yet is still easily removable for cleaning. Exclusive design allows for window blinds, curtains, and shades to operate normally! Cover easily removes for washing. One-year limited warranty.From the manufacture:At K&H we know how much you care about your pets. That's why with over 20 years of experience, we design innovative. quality products to make their lives better.