4 Way Interlock: On, Off, On/Off, Locked. Cat flap with four settings: open inward, open outward, open both ways, and fully locked. Easily allows pets to go in and out. With the cat flap, there's no need to constantly open and close the door for your pets. Perfect Glass Decoration: Clear design integrates seamlessly with window glass, ideal for viewing windows, sliding glass doors, and glass windows. Suitable for various glass installations. Pets will love the stylish pet flap. Smooth and Comfortable: Two-part door with brush strip to reduce noise. Inner rubber seal helps protect cats from injury. Silent operation does not startle pets or disturb owners, making it easy for cats to access their litter box. Durable and Resilient: Made of durable ABS plastic, weather-resistant for long-lasting use. Features robust, UV-resistant polycarbonate construction for added strength and durability.