The door suction is installed behind the door. After the door is opened, the magnetic attraction of the door is stabilized to prevent the wind from automatically closing. In the fixed state of the door, the door sucks to prevent it from moving freely, that is, the device that keeps it in a fixed state. Ground suction is the same as its principle. Door suction, preferably nailed to the wall; suction, preferably nailed to the floor. It is recommended that you use the door as much as possible, because when the floor is mopped, the door suction will not block the mop like the "趴" on the ground.