🐱One-Step Sliding Clamping Slot Adjustment: This cat perch is of sliding clamping slot adjustment design. Just adjusting by one step – pushing the sliding clamp to the slot that fits the thickness of the carrier. It is so easy that no tools but your hands are needed for each time adjustment. Just pick this cat bed up can it be move from one place to another place. 🐱No Suction Cups Dropping Risk: This cat bed is fixed by the metal hook hanging on the place. No suction cups are needed for the installation and fixation, of great safety. The metal hooks are 2cm extended from the body of the cat bed that all kinds of window with slot. There is no worry that the window can’t be closed with this cat bed on the window sill. 🐱Randomly Switchable Two Fabrics Covers: Two covers made of two different kinds fabric come with this cat bed to adapt different seasons use. One is breathable and waterproof textilene fabric cover, suitable for summer use. The other is soft and comfortable fluffy cover, perfect for keeping warm in cold weather. It can be directly superimposed on the bottom by the zipper on it. Both of them can be easily removed for wash.