This is a pet door opener that allows pets to freely enter and exit the room. The door opens with a push of a pet, making it easy to pass through. The pet can move between rooms by themselves; The door automatically closes so it does not reduce the efficiency of air conditioning such as air conditioners; Easy to install on the top of the door; If your pet is opened to move between rooms, the efficiency of air conditioner and the like. However it is hard to open the door every time. This product solves the trouble of those owners. The only thing you need is that your pet can open and close the door by themselves. If you open the window, it may not work well. Use as a countermeasure for air conditioning.