Introduction - If you have any usage issues, please Google them yourself
(1) when you press the acceleration can speed up a small fan rotation speed.
(2) when pressed against the rotation can be reversed,
(3) slow down when you press the deceleration rotation.
(4) can be reversed when you press the reverse
(5) may be suspended
(6) also can be a small scroll bar to control the fan rotation speed, when the sliders can be