I have one like that from LV years ago. No light is require as the optics bring in ambiant light unless fat fingers block it. The location where the cross hairs are is flat the to is curved for magnification, focal length is by eye distance to optic.
Sight, align, hold down, pull optic, insert punch, tap, done.
The base has an o-ring imbedded to help prevent movement. So a gentle touch is needed removing and inserting.
Works well, but if you've learned how to use a center punch correctly the center punch is way faster.