Interesting job descriptions. They are looking at vision based methods of finding the target devices to beam at? That sounds a rather weird approach
It sounds like a getting desperate approach to me.
Their biggest problem (among
many) is efficency. Efficiency is practically zero unless you know
precisely where the phone is at least several meters away and you can steer your beam toward it. And then because people are pesky and move around all the time and block your beam, you need to be able to have multiple transmitters and now perhaps vision system to see if the phone is line of sight, and then switch transmitters as required.
Ubeam has to be the ultimate project that has fallen down the rabbit hole of impracticality.