Before ordering, please measure your cat's weight and waistline to ensure a proper fit. The cat flap can be installed on interior doors, exterior doors, walls, cupboards, and similar surfaces. Key benefits Frees you from constantly opening doors. Your cat can enter and exit more independently, helping to streamline daily routines. Lockable and adjustable opening. Control when your pet can come in or go out, with a setting that suits your cat's size and your household needs. Secure when not in use. Magnets on the door and four buckles allow you to fix the flap to prevent pets from going out when you want to restrict access. Features and compatibility Installation versatility: suitable for interior doors, exterior doors, walls, and cupboards. Adjustable access: the opening can be set to fit your cat and to manage pet flow between spaces. Security design: a lockable flap plus magnets and buckles provide reliable control over pet movement. Use scenarios Scenario 1: In a multiroom home, let your cat move between living areas without repeatedly opening doors, while you maintain control over access as needed. Scenario 2: In a home with dogs or other pets, use the lockable feature to regulate the cat's movement and prevent unwanted access to certain areas. Scenario 3: Install on an exterior door, wall, or cupboard to grant controlled outdoor access or to secure a designated area such as a kitchen or pantry, while still allowing your cat to pass through when desired.