These are the same guys who, last year, had a little ultrasonic power transmission link made from old camera ranging sensors.[1] They were very vague about efficiency and range then, and they&#x27;re very vague about efficiency and range now.<p>The first picture shows the Earth from space.  Ultrasonics don&#x27;t work in vacuum, guys.<p>Covered on YCombinator last year.[2]<p>[1] <a href="http:&#x2F;&#x2F;www.engadget.com&#x2F;2014&#x2F;08&#x2F;07&#x2F;ubeam-wireless-charger-ultrasound&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.engadget.com&#x2F;2014&#x2F;08&#x2F;07&#x2F;ubeam-wireless-charger-ul...</a>
[2] <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=8542091" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=8542091</a>