That is the kind of wearable device I might actually use. My guess is this is a mock up and some video special effects, as the bracelet seems to be too small to incorporate all parts of a real smart phone/tablet. It sure does look like a cool concept.
How does this device adapt to different skin color/tone? What happens if you are a really dark skinned black person? Does that increase the contrast or take away the brightness/white balance? Can it be calibrated to different skin tones? I'm really pale, so I guess it would work OK for me, but my wife is more dark olive tone, so would her colors be all off on this device? What about people with freckles?