This cat flap is specifically designed for kittens. Features multiple modes that provide easy access to pet controls. Door Lockable Safety Gate Puppy Cat Dog Entry Door Pet Puppy Cat Hole Uniform texture, stable structure, easy installation and very durable. The surface is smooth, the material is delicate, and the mothproof is dense. Pet gates are perfect for small puppies and cats that are used daily in the home. Note: To ensure the cat flap fits your pet, please measure your pet before purchasing. feature: The frame and the inner panel are made of two pieces inside and outside, which is easy to install. Use the plugin if the door only allows the control lane: only outside or not inside. Suitable for all door and window screens, cat doors, dog doors, suitable for small or medium or large cats and dogs. Specification: 1. Cut two blades that can be controlled inside and outside. 2. Disassemble the cat flap into two pieces. 3. Install the frame on the screen door and push the pins into the screen. 4. Glue the pin buckle and the screen with glass glue. 5. Cut the screen with the frame to form the frame. 6. The screen you cut can be installed between the interior panels to prevent mosquitoes from entering. 7. Hook the inner panel to the frame. 8. Attach the other (inner) frame.