4 locking modes: open, closed, inlet alone or exit alone. This lets your cat enter and exit as it likes while you retain control of the door. This magnetic pet door is suitable for windows, glass doors, brick walls, PVC doors, uPVC and metal doors. It provides flexible installation options for different homes and door types. Made of ABS plastic, this cat flap is durable and resistant to scratching by cats or small dogs. It is easy to clean and designed for longterm use. With this cat flap you can control your pet's comings and goings and your time from constantly opening the door. At the same time your pet will enjoy a large and home. Use scenarios Install on a glass door or window to give your cat independent access while keeping the main door closed for energy efficiency. Fit into brick walls, PVC doors, uPVC and metal doors to expand installation options in homes with different door materials. In busy households, use the locking modes to manage access and reduce the need to repeatedly open the door while your pet still has freedom to move.