Features: 1.The frame and inner plate both are made of interior and exterior two pieces, easy to install 2.With inserts, so the door allows single way control: only go out or only come in 3.Inner plate is hung at the flame, more flexible to open and close, not easy to break or drop off, sturdy and durable 4.Designed with strong magnet, this door will auto shut down after pet goes out or comes in 5.Easy to control, your pet will go in or out without constriction Specification: Description: This cat door is made of durable and sturdy plastic, with simple window-like design. Interior and exterior two pieces design, easy to install, suitable for screen door and window. Magnetic door will auto close after pet's movement. Great for pet cats and dogs to give them a comfortable environment. Features: The frame and inner plate both are made of interior and exterior two pieces, easy to install. With inserts, so the door allows single way control: only go out or only come in. Inner plate is hung at the flame, more flexible to open and close, not easy to break or drop off, sturdy and durable. Designed with strong magnet, this door will auto shut down after pet goes out or comes in. Easy to control, your pet will go in or out without constriction. Specifications: Condition: 100% Brand New Material: Plastic Color: Black, White, Brown (Optional) Size: Large, Middle (Optional) Large: Outer Frame Size: approx. 45.2 x 35cm / 17.80 x 13.78in Inner Plate Size: approx. 40 x 30cm / 15.75 x 11.81in Middle: Outer Frame Size: approx. 36 x 28cm / 14.17 x 11.02in Inner Plate Size: approx. 30 x 22.5cm / 11.81 x 8.86in Weight: approx. 610~865g Package Included: 1 x Pet Door Installation Instruction: 1. Cut off the two inserts which can control getting in and out. 2. Take apart the cat door into two pieces. 3. Fix the outer frame at screen door and press pin buckle into screen mesh. 4. Use glass adhesive to stick pin buckle and screen mesh tightly. 5. Cut the screen mesh within frame along with the frame. 6. The screen mesh you have cut can be installed between inner plate to prevent mosquitoes. 7. Hang the inner plate at the frame. 8. Fix another(inner) frame. Finish. Note: 1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.