The Karlie cat doors Porta make life easier for outdoor cats and their owners. They consist of a frame, a hinge, and a horizontally mounted flap. The flap is pushed forward by the cat's head to enter through the opening. This allows the cat to independently and safely switch between the house and the outdoor area. A magnetic closure and a brush seal make the cat door weatherproof and draft-proof. Additionally, the locking system allows control over whether the cat can come and go freely or if access is restricted. The mechanical cat door with a 4-way lock offers the choice between open (both in and out) and closed, as well as the options for in only and out only. The door also features a tunnel element (50 mm) for covering the passage.