Features: HIGH QUALITY AND DURABLEThe frame is made of high quality material with long-life use, while the flap let pet see through the door clearly.Large out size: 37X43cmSmall out size24X29cm This light-Pet Screen DoorDog Door with Magnetic Flap Closures It Can Keep the Door Automatically Closed when Your Dog Leaves. weight pet flap door with high quality lock sheet allows you to install a exclusive door into an interior or exterior wall,after your pet passing through the door, it will get closed automatically.The product is not equipped with magnets, customers need to purchase magnets by themselves 4 SWITCHES MODELFour independent models to lock the cat flap door with switches --- swing out only, in only, both in and out, and fully locked, easy to control your pet's in and out. Simple InstallationDog Screen Door is Easy to Install. You Can Install It Directly into Your Existing Screen Door,Window or Porch Screen for Quick and Easy Installation, and Blends Perfectly with Your Existing Screen.Just fxed by screw to prevent from coming off.Suitable for all doors, windows, panels or any other screen area. EASY TRAININGThe transparent flap allows your cat to see her food or litter box on the other side of the door, making training and acclimation stress-free. What's more, the flap is wrapped with brush strip to reduce noise and power for cats to push. NoticeThe outer frame size of the L size dog door is 43X37CM, and the inner frame size is 37X31CM. S size dog door outer frame size is 29X24CM, inner frame size is 24X19CM