While interesting (and cool), I thought it was curious that in this demonstration, at no time did it appear on a person's wrist. It suggests you need to remove

While interesting (and cool), I thought it was curious that in this demonstration, at no time did it appear on a person's wrist. It suggests you need to remove it in order to use it. That's a bit like demonstrating a healthy beverage, but never stirring, pouring, splashing or tasting it, or demonstrating an innovative clothing article without taking it off the rack.