General description This waterproof cat flap features a convenient 4-way rotary lock, allowing you to control your pet's access with ease. The locking mechanism includes options for in only, out only, free in and out, or completely locked, providing flexibility for your pet's movements. Technical specifications Inner size: 15 x 15.5 cm Outer size: 22 x 19 x 5.5 cm Suitable for cats with a waist circumference of less than 40 cm Installation Includes step-by-step installation instructions and a demonstration video Comes with 2 packs of screws (8 screws each: one pack of short screws and one pack of long screws) The depth of the tunnel can be adjusted according to installation needs Can be installed on various surfaces including interior doors, exterior doors, walls, windows, closets, and glass Usage Easy to control your pet's entry and exit options with the button-style switch Weatherproof brush strip helps reduce noise and prevents rain, wind, and insects from entering