1) （car lock)
When the central control driver locks the door around him, other doors are locked at the same time. The driver can open each door at the same time through the door lock switch, or open a door alone.
(2) (car lock)
Speed control when the driving speed reaches a certain value, each door can lock itself.
(3) (car lock)Independently control other doors except the driver's door, and set a separate spring lock switch to independently control the opening and locking of a door.