4 Way Interlock: On, Off, On/Off, Locked. Cat flap with four settings to control access: open outward, open inward, open both ways, and fully locked. Easily allows pets to go in and out. The cat flap eliminates the need to constantly open and close doors for your pets. Perfect Glass Decoration: Clear design integrates seamlessly into window glass. Ideal for viewing windows, sliding glass doors, and glass panels. Suitable for various glass installations. Pets will love the sleek pet flap design. Smooth and Comfortable: Two-part door with brush strip to reduce noise. Interior rubber seal helps protect cats from injury. Silent operation does not startle pets or disturb household members, allowing quiet access to litter boxes or outdoor areas. Durable and Resilient: Made from strong ABS plastic, weather-resistant and designed for long-term use. Features robust, UV-resistant 100% polycarbonate construction for maximum durability and reliability.