At best this is a pipe-dream with no basis in reality - at worst it's a scam.
Here's the thing - your skin is never going to work as a touch-interface by projecting some light on to it.
It simply isn't going to work.
These people are proposing to make compact the technology of modern cell-phones down to probably 10%(or less) of the usual size (compare the size of the bracelet with a cell-phone, seriously), and then have a screen projected on to your arm (another difficult piece of technology that requires space the bracelet doesn't provide - like where's the lens?), which is supposed to be a projection that is sensitive to touch, despite the fact that there is no physical receivers, and the only way for a device like that to react at that point would be by registering interference to the light-projections (a technology I'm not even sure works at this point, if ever), which would have to vary depending on what is on the screen at the time (which would require tons of memory and processing power, which would require more space).
Or it would have to similar to motion capture technology (which again takes up a lot of space).
(think the Xbox Kinect - how is the bracelet supposed to read your finger movement and "button presses" when all similar technology has issues just picking up your individual arm movement with accuracy?)
People wasting their money on this are as gullible as the suckers who invest in the "solar freakin' roadways" and "hoverboards".
What's wrong with the world? It's like everybody just walk around with their eyes closed, heads bumping of walls, without taking in anything of the information out there that would allow you to build the mental rigor to see through bullshit like this.
