1.Manual gear shifting can be realized, so that the driver can quickly shift gears up and down without using the gear shifting lever, and it can help the engine maintain the speed in overtaking, climbing and other scenes, and gain power and control. 2.It is connected with the electronic control system of the vehicle, and the signal is transmitted to the ECU. The ECU controls the gear shifting actuator to switch gears, which is a manual intervention to the automatic transmission system. 3.It is mostly installed on the rear side of the steering wheel, with left downshift and right upshift. It is divided into fixed (fixed to the steering column) and followup (rotating with the steering wheel) to meet different operating habits. 4.Improve the driving pleasure and sense of control, the driver can actively choose the gear, which can better control the speed in special scenes, reduce the dependence on braking and improve.