Note: The airbag type edge switch is a pneumatic wave generated by the natural air pressure in the trachea, triggers the copper foil in the switch to give a signal to the controller; due to its low price, it has been applied to low-end markets (such as residential areas). Barriers, bus doors, various automatic door industries); the airbag hose’s airtightness, the damage of the hose, and the high or low outside temperature will cause the switch to malfunction or fail. In addition, the body does not have the detection function, and the contact cannot be judged in the first time.