Freedom & Convenience - Through the great cat door, your cats or small dogs can go in and out easily and quietly. They wont feel trapped and you no longer bother to open or close the door for them. Safer with 4 Lock Modes - By slide the switches, you can adjust the access mode to Free In & Out, Fully Locked, Out Only, In Only, control your pets access and keep away stray animals. Durable & Comfortable - Made of sturdy ABS plastic, the cat door interior door is ready to serve your pets for long time. With sealing well strip, magnet for aligning, it can keep away bugs and the smell of cat litter, reduce the loss of cold air in summer and the loss of heat in winter. X-Large Size & Versatile - With 25cm x 27.7cm outer size, 20cm x 22cm flap,this pet door is for cats and small dogs with waist circumstance shorter than 62.99cm. Perfect for interior and exterior doors of wood, PVC, metal, paneled etc. It also can be installed in windows, wall, cat litter box etc. Easy to Install - The cat door for exterior door comes with detailed instructions, 8 screws and their caps, double-sided tapes. After the necessary tools are ready, you can DIY easily. In addition, the tunnel depth can be cut on demand. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store