Grunff wrote in message news:c13egs$1b9u00$1@ID-
That's exactly what it does. It's an LCD (like a digital watch display).

The big advantage is that it means you don't have to [a] hold a mask to
your face or [b] flip a mask down. So you can use your hand to hold
stuff, and keep your head still.

What ever happened to the time old tradition of holding everything in
place, shutting eyes and turning head while making a squirmy face
while welding? Don't you lose out on the sun-tan using a mask?