Four locking modes: open, closed, in alone, or exit alone. This configuration lets your cat enter and exit as it pleases while you retain control over access. Compatible surfaces: suitable for Windows, glass doors, brick walls, PVC, uPVC and metal doors. Material and durability: made of ABS plastic for durability; resistant to scratching by cats or small dogs; easy to clean; designed for long life. Key benefits: Control pet movements without constant door handling Reduces interruptions to your routine while giving your pet freedom Encourages a larger, more comfortable living space for your pet Use scenarios: Everyday convenience: you're occupied or away for work and your cat can come and go through the door without waiting for you. Installation versatility: mount on windows, glass doors, brick walls, PVC, uPVC or metal doors to fit different areas of your home. Open, accommodating space: enables your cat to explore a larger area indoors while you manage access as needed.