This is very fascinating watch my girlfriend bought me for Christmas last year. She bought it while it was still in development, so it just recently arrived.
The watch face is normally just blank, but when you tap it or shake it in a certain way (such as moving it into position to see it) the number light up.
You touch and hold the face of the watch to change the time, or swipe to change the function. It's pretty clever.
Also, it's charged with USB (no more watch batteries!) and instead of an alarm...it vibrates! Brilliant!