Features: The frame and inner plate both are made of interior and exterior two pieces, easy to install. It can be installed at screen door, window and other screened areas. Allow your pet go in or out freely and also prevent mosquitoes from entering room. 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(Optional) Size: L, XL (Optional) L: Approx. 29 x 24 x 1cm / 11.42 x 9.45 x 0.39in(External Dimensions) L: Approx. 25 x 19.7cm / 9.84 x 7.76in(Inner Dimension) XL: Approx. 45.5 x 35.5 x 1cm / 17.91 x 13.98 x 0.39in(External Dimensions) XL: Approx. 40 x 30cm / 15.75 x 11.81in(Inner Dimension) Weight: approx. 317~835g 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.