Give your cat the best possible view with Prevue Pet Products Tabby Napper. Tabby Napper is the first portable window bed for cats that works on both casement and double-hung windows. The cat bed cradles cats in fleecy comfort, and the hook & loop fastener strap underneath the cover adds extra support. Cats will be engaged and entertained for hours, preventing boredom and destructive behavior. Perfect for homes with multiple cats, the sturdy steel frame construction can hold several cats at once up to 35 lbs. Tabby Napper is recommended for both kittens and adult cats. The cover is removable and machine washable. Prevue Pet Products Tabby Napper measures 24 inches Long and 14.75 inches Wide. The Tabby Napper is easy to assemble and install, no tools are needed. The Tabby Napper fits in double-hung (aka vertical sliding windows) and casement windows (aka crank windows). Tabby Napper is compatible with casement and double-hung windows only. For the stability and protection of your pet and home, Keep the window closed once your Tabby Napper is installed. Requirements for installation: Windowsills must be a minimum of 3 inches deep and 24.5 inches Long Tabby Napper is not recommended for windows with plantation shutters To install Tabby Napper permanently, owners can tightly screw brackets into the windowsill using two screws. (Required tools and hardware not included)