3 ms·

This is not fake. It is real. It is, however, put on display in a such a way that masks all the very real limitations on such technology. The sensors + batteri

• jacquesm 9y ago
  > The sensors + batteries in the box is an absurd claim. No more absurd than that uBeam will deliver meaningful power using ultrasound. So if they are going to show a demo that does what they claimed originally then the contents of the box would definitely be subject to scrutiny. I've had a really nice rigged demo tried on me during a tech DD once and that tech was a lot more believable than what is on display here so some skepticism is warranted. Also note that the 'charging' indicator lighting up is mostly a function of applied voltage and not so much of the current flowing, even a tiny bit of current would do the trick. I should measure with one of the phones here and a variable power supply what it takes to get that indicator to come on but I know it can't be much because a small solar cell will do it too. http://www.instructables.com/id/How-20-Make-a-Solar-Cell-Phone-Charger/ http://www.instructables.com/id/How-20-Make-a-Solar-Cell-Pho... (Conveniently does not mention how much current flows but that's right in the spirit of tfa.)