Macvoices video of uBeam floor demo at CES
So they power an LED at an unclear distance, maybe 1 meter, it's that white box from the top right of the recent image from the demo kit. Watts, dB, or any other performance metric not given. The transmitter looks to be (from the video in the background) the white plastic box shown about a year ago, labelled March 2018 in the attached image. That seemed to have 16 by 16 Murata profile devices, so 256 total and around 7.5W absolute max acoustic power out if they stick to 145 dB (.0256m^2 and 290W/m^2), likely less. There is a noticeable delay in tracking finding the new position - where's the beam going in that time?
Claims of safety made me choke. Yes, ultrasound bounces off skin (99.9%), but hair causes heating, and at 145dB and up there are papers showing measurable temperature rises, and ultimately death, in mice and rabbits. Also claim lots of "3rd party testing" shows it's safe - if so they should release it. Also claim safety as it's a controlled beam, if they are using Murata sized devices there are grating lobes sending out additional beams at 45 degrees. No mention of OSHA, UL, FDA, or other regulatory bodies.
http://archiwum.ciop.pl/59815"According to Allen, Rudnik and Frings, a mouse dies from overheating after 10 s to 3 min of exposure to a signal of 20 kHz and level of 160 dB [10]. According to Danner, a lethal level for signals of 18–20 kHz for an unshaven mouse were 144 dB and for a shaven mouse 155 dB [21]. Acton obtained similar results and extended studies to larger animals such as guinea pigs and rabbits [22]. "They say they are focusing on "Industrial IoT", low power sensors etc. More robust demo in private at the suite where they power cameras and sensors. Why admit your floor demo is "not robust"?