• This pet screen door for dogs or cats go in or out freely enough without asking for your help to open the door. Its magnetic door flap can slow the door down and stop it in place after 3-4 swings.
• Use the flat-head screwdriver to separate the door for installing, inner Door flap didn't come with a screen insert, need to put this door on the existing screen door, then cut down screen against the frame and place it inside the door flap.
• Cut off top two tabs and lock one tab into one side slot, keep your pet's safety and pass the door under your awareness, double-sided slots lockable.
• Four retractable zips to fix upper door frame to prevent this dog screen door from falling down whether you end up using glue or not. Not glue provided in package.
• This doggy door only fits into the screen door or window or thinner exterior door, not in a thick aluminum door or glass door. Inner door size: 12 x 16 inches; Outer frame size: 13.8 x 18 inches; must install base on the pet's height, it fit most pets, but not recommend for especially little kittens and puppies because this big door too heavy.

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