The display used in Neets Contro - UniForm is best compared with a normal piece of paper. This means that the display doesn't emit any light and therefore not visible in a dark room.
That said; it does not take much light in a room, in order to decode the dispaly, because of the high contrast ratio an E ink offers.
The benefit by this is that, when presenting, you are not disturbed by light from the display.
If you want to know more about the E ink dispaly see this article.