4 Way Interlock: On, off, on/off, locked. With cat flap with four models to lock with switches, only swing out, in and out, and fully locked, easy to drive your pets in and out, with the cat flap, you no longer had to close and open the door all the time to wait for your pets.Perfect Glass Decoration: Clear design to make your window glass in integrated mass, best for viewing windows, sliding glass doors, glass windows, Ideal for all glass adjustments. Your pets will instantly fall in love with the stylish pet flap.Smooth and Comfortable: Two parts with the cat flap. Door brush strip prevents noise from the door, inside rubber ring to protect your cats from injury, the silent action does not scare pets and does not bother the owner to let the cat get into her litter box.Durable and Resilient: All cats doors are made of durable ABS plastic, weather resistant, and favor convenience and ease of use; robust UV-resistant 100 % polycarbonate construction ensures a virtually unbreakable dog door.