What is the Stylus Wheel on the Wacom Airbrush Pen?

Question

Design

Stylus Wheel is a stylus wheel? or copy wheel? Why is there such a confusing translation of "Copy wheel" in the words Stylus Wheel because there is no word copy.
Is the Stylus Wheel a mouse wheel on a stylus or is it much more functional?

Answer 1

This is analogous to the trigger of a conventional airbrush. It controls the amount of paint (spatter). But it's a Wacom, so it's likely to have other features (such as brush size) as well.