The cat door consists of a plastic frame with a transparent, flexible flap surrounded by a brush seal to prevent drafts. The product includes two locking sliders in red and blue, allowing for four locking modes, and a mounting kit with screws and caps. It is designed for installation in doors or walls, enabling the cat to pass through independently. The installation instructions provide guidelines for cutting the opening in various sizes (S, M, L, XL) and how to install the door using the included mounting components. Product specifications: plastic frame, transparent flap with brush seal, two locking sliders, mounting holes, screw and cap kit, installation instructions with size markings.