4 Locking Methods: The cat flap has 4 locking methods: inward opening, outward opening, two-way opening and locking. If your pet wishes to enter the room, you no longer need to open the door. The cat door makes your life easier and gives your pet more freedom at home. Very quiet: this pivot door is very quiet and offers the best protection against the wind thanks to the specially reinforced door panels. The three-sided brush strips can eliminate noise when opening and closing the door. It also stops raindrops or pests like mosquitoes. Easy Installation - This pet door is suitable for brick walls, wood doors, PVC and metal doors, and can be installed in doors and walls with a thickness of 2-5cm. A step-by-step installation guide in the user manual (French not guaranteed). Please note this and prepare the necessary tools which are easy to install if needed. Premium Material: The door frame is made of polypropylene, and the transparent cover of the flap is made of high strength polyethylene, which can resist ultraviolet rays, has good transparency, prevents pets from grabbing and biting, and is resistant to moisture and abrasion. Suitable for - Interior Dimensions: 3cm (depth) x 15cm (width) x 14.7cm (height), suitable for pets with a waist circumference of less than 44cm.