【Scalable Design】: This retractable baby safety door can extend up to 59 inches (150 centimeters) wide and 34 inches (87 centimeters) high, and can be adjusted according to your needs. When in use, the mesh cover can be fully retracted, saving you space. 【High Quality Material】: The baby expansion door is made of high-quality aluminum shaft, PP plastic, and PVC mesh, all components are non-toxic and odorless. The sturdy and soft mesh prevents babies from accidentally hitting the door and getting injured. 【Structural Safety】: The retractable door with dual locking device can effectively block babies and small and medium-sized pet dogs, keeping them away from danger and providing a safe and enclosed playing environment. 【Single Handed Operation】: Simply press and twist the button to lock and unlock the safety door with one hand. It is very convenient to use when holding a baby or holding toys or diapers. 【Convenient to Move】: You can easily move the door from the living room to the staircase or other places by locking it in and out. It can be installed on stairs, doors, corridors, indoors and outdoors, making the playing environment for babies safer.