4 locking options (open, stop, open/close, lock) 4 modes of cat stopper, lock with a switch, just turn and fully lock inside and out, easy control to get your pet in and out; with the cat stopper you no longer need to keep closing and opening the door and waiting for your pet to arrive. Perfect for glass decoration - the clean design fits your windows, ideal for windows, glass sliding doors, glass windows; suitable for all glass conversions; your pet will instantly fall in love with this elegant cat stopper. Simple and comfortable - the cat flap has two parts: the door brush dampens the door noise and the rubber ring inside protects your cat from harm; the silent movement will not frighten your pet or disturb the owner. Cats are free to go to the litter tray. Durable - all doors are made of strong, weather-resistant ABS plastic for comfort and ease of use - strong, UV-resistant polycarbonate construction makes the door virtually unbreakable. Suitable for all pets Size: outer dimensions 30*30*3.5cm, inner dimensions 18.5*20.5cm, suitable for all types of cats and some small dogs; to give your pet more freedom, don't hesitate to order this hatch.