The switch input is performed by changes in the up-and-down or back-and-forth movement of the shoulder.
It can be used to recognize the up-and-down movement of the shoulder in a sitting position and the back-and-forth movement of the shoulder in a lying position.
When the shoulder is raised above a certain level (or moved forward), the switch is recognized as being turned on.
At other times, the switch is recognized as being off.