This seems like the definitive source for technical information on uBeam:<p><a href="http:&#x2F;&#x2F;www.eevblog.com&#x2F;forum&#x2F;projects&#x2F;the-ubeam-faq&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.eevblog.com&#x2F;forum&#x2F;projects&#x2F;the-ubeam-faq&#x2F;</a>