The frame and inner panel are split inside and outside, easy to install to let your pet go in and out freely and prevent mosquitoes from entering the room With a strong magnetic design, it automatically shuts off when pets enter and leave. Easy to control, your pet will have unlimited access < p>Made of sturdy plastic, this cat flap is designed for screen doors and windows, allowing pets to come and go freely. Split design inside and outside, easy to install. The magnetic door closes automatically after the animal moves. Perfect for domestic dogs and cats, providing them with a comfortable environment. Size L: approx. 29 x 24 x 1.5 cm. Package content: 1 door for pets. Installation Notes: 1. Cut out the two inserts that control the water inlet and outlet. 2. Divide the cat flap into two parts. 3. Mount the outer frame to the screen door and press the pin ring into the screen grid. 4. Use glass glue to firmly attach the clip and screen grille. 5. Use the frame to cut the screen inside