[4-Way Lock] Four Modes (Entry Only, Exit Only, Entry and Exit, Closed) can be controlled automatically by the Door Knob. [Pet Body Size]Inner Size: 15 x 15.5cm(W*H), Suitable for Cats with Waistline Less than 41cm to Pass Through the Cat Door Easily. [Quiet and Freedom] The non-direct contact magnet and brush can reduce the noise caused by pets entering and leaving. The transparent door panel ensures that pets can observe the environment inside and outside at all times in complete safety. Specifications:M External size: 15cm (W) * 15.5cm (H) Inner size: 19cm (W) * 22cm (H) Compatriot: 5.5cm Material: ABS plastic Suitable for cats whose waist circumference is less than 41cm, please measure the cats waist circumference, choose the size suitable for your pets. Magnetic Pet Holder Freedom Mute The magnet and the non-direct contact brush can reduce the noise caused by the entry and exit of animals. Four modes (In only, Out only, In Out, Closed) can be automatically controlled by the gate