The official numbers from uBeam are 1.5W <i>maximum</i>, in <i>ideal</i> circumstances: <a href="http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;11&#x2F;07&#x2F;wireless-power-charger&#x2F;" rel="nofollow">http:&#x2F;&#x2F;techcrunch.com&#x2F;2015&#x2F;11&#x2F;07&#x2F;wireless-power-charger&#x2F;</a><p>You may want to read the writeup which forced that disclosure: <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>