Simple installation steps: This can be done on wooden or PVC doors. Required adapters for brick walls, windows and French windowsadapts to various climatic conditions: thanks to its weather-resistant strip and its function of dual automatic lock enhanced, wind or The heat stay outsideoffer greater freedom to your dog or chat: this allows you to offer maximum freedom to your dog or cat; It's an ideal solution to let cats and dogs enter your home without having to open the door frequently. Your pet will be more independentSimple and convenient locking: In addition to being easy to install, this door also allows you to offer maximum freedom to your dog or chat.Resistance: This cat is robust and durable, thanks to its transparent plastic blade and its high quality durable plastic frame; The door is suitable for most standard walls and doorsthere are four modes(1) Close the lock of the cat in both directions.(2) means that the door opens in both directions.(3) Allow cats to go out, but do not leave cats enter.(4) The entry is allowed but not the output.easy to install, simple and generous.Good quality, using ABS material (ABS material imported)large size, larger size, suitable for many big cats.size template: (support selection)size m: Frame size: Height 22.3 * Width 19.2 * Thickness 5.5 cmSize of the door cover: Inner height 15.5 cm * Width of the inner door 15 cmSize L: Frame size: Height 24 * Width 23.5 * Thickness 5.5 cmSize of the door cover: Inner height 19.5 cm * Width of the Inner door 17 cm