4 Way Interlock: On, Off, On/Off, Locked. Cat flap with four locking modes: only swing out, in and out, and fully locked. Easily allows pets to go in and out. The cat flap eliminates the 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 all glass installations. Pets will love the stylish pet flap. Smooth and Comfortable: Two-part cat flap design. Door brush strip reduces noise, while an inner rubber ring helps protect cats from injury. Silent operation does not scare pets or disturb owners, allowing cats to access their litter box easily. Durable and Resilient: Made of durable ABS plastic, weather-resistant for long-lasting use. Features robust, UV-resistant 100% polycarbonate construction for a virtually unbreakable pet door.