Is there an extra charge for opening the small door of the electric sliding door?

Need more money. Adding a small door increases the time cost of artificial materials, and the price is also added. Electric sliding door is a kind of sliding door, which can recognize the action of people approaching the door (or some kind of access authorization) as the control unit to open the door, open the door through the driving system, and then automatically close the door after people leave, and control the opening and closing process.