I assume that there is some sort of transmitter inside the glove's fingertips and then a receiver on the front of the mask. An alternative implementation could

I assume that there is some sort of transmitter inside the glove's fingertips and then a receiver on the front of the mask. An alternative implementation could be to have a mechanical detector inside the glove, that only detected the fingers relative position. This wouldn't require a wireless transmitter and could still function as a hci. It obviously wouldn't allow the kind of overlay that we see in the demo video though, but it would probably be less prone to malfunction. Maybe they combine both methods?