What units does Input.GetAxis("Mouse X") use?

I’m trying to make an aim training simulator for Overwatch, and I need to make sure the sensitivity scale in my game match’s Overwatch’s. To do this, I need to know exactly what Unity means when it says the mouse moved by “0.21” in the x-direciton. What units is that in? Pixels? Dots? Inches? I can’t find this information anywhere on google.

Thanks in advance!

The docs say:

If the axis is setup to be delta mouse
movement, the mouse delta is
multiplied by the axis sensitivity

They don’t say anything about what the mouse delta would be, but since it’s movement and movement is a change in position it should be the position delta, and that’s in pixelcoordinates.