Some divers use dive computers on their wrist to get essential information like their depth, dive time, and how long they can stay at the depth they're at. These are very important information for which without them could be dangerous for divers who go deep. If you're a diver, it makes sense to have these information right in front of you since it's that critical. That's what the Datamask does.
Inside it is a miniature LCD screen that allows you to focus on the dive while presenting critical dive data, which includes depth, dive time, cylinder pressure, and remaining dive time – right in the corner of your eye. It's almost like google glass but without all the other features.
It would've been perfect if it had a GoPro mount like the Octomask.