【4-Way Lock】Four Modes (Entrance Only, Exit Only, Entry and Exit, Closed) can be easily controlled by the Door Knob. 【Pet Body Size 】Inner Size: 18 x 19.5cm(L*H), Suitable for Cats with a Waistline of Less than 55cm​ to easily pass through the Cat Door. 【Quiet and Freedom】 The magnet and the non-direct contact brush can reduce the noise caused by pets entering and leaving. The transparent door panel ensures that pets can safely observe the environment inside and outside at any time. 【Easy Installation】 Can be installed on the wall door / wood / PVC. The installation diagram in the package shows how to install it easily. 【Quality and Warranty】 Beautiful and durable ABS material will not be damaged by the influence of daily use.