To those who are interested in reading more of this tech:<p>uBeam&#x27;s patent:
<a href="https:&#x2F;&#x2F;www.google.com&#x2F;patents&#x2F;US20120299540" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;patents&#x2F;US20120299540</a><p><pre><code>    &quot;Because decibels are a logarithmic scale, a decrease of
    3dB is half the power. With the uBeam system, being just 
    one meter away from the transmitter will bring the power 
    down by half... It’s also absolutely insane. For something 
    that claims to be as easy as WiFi to install, look at the 
    differences: WiFi merely requires a single router to be 
    installed anywhere in the store. uBeam would require a 
    dozen transmitters, each of with include mechanical 
    steering for their transducers. uBeam would require 
    everyone to buy an ultrasonic power receiver for each 
    device.&quot;[0] 

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[0]<a href="http:&#x2F;&#x2F;hackaday.com&#x2F;2015&#x2F;10&#x2F;20&#x2F;the-curious-case-of-ultrasonic-power-transfer&#x2F;" rel="nofollow">http:&#x2F;&#x2F;hackaday.com&#x2F;2015&#x2F;10&#x2F;20&#x2F;the-curious-case-of-ultrasoni...</a>