Safety doors can be installed in glass doors, wooden doors, iron doors, security doors, and glass windows. It also prevents the escape of heating and cold air. Cats can pass through the front and back of the door and can be adjusted as desired. Also suitable for small dogs.Specification :Material: ABS (acrylonitrile butadiene styrene), acrylicThis Pet Door is suitable for windows, glass doors, brick walls, PVC, PVC and metal doors.Description:Cat Flap for Cats and Dogs Size L (23.5 * 25.2 * 5.5cm)Material: plasticColor: whiteSize L of whole flap including frame: 25*23.5*5.5cmThe current flap: 19 * 18.2cmLet your cat pass through every interior doorGive your cat the freedom to come and go as they please with this cat flap featuring a 4-position locking system.Features:4 ways to check in and out:(1) Pull the red button to the right and the blue button to the left, the flap will unlock. The cat can come and go.(2) Remove the left red button and left blue button, cat can only enter and not exit.(3) Remove the red keys on the left and the blue keys on the right, cat can't go in and out.(4) Remove the red button to the right and the blue button just remove to the right, remove the cat and can not go down.