One Response to Recharge your phone with ambient wi-fi signals

  1. JLundell Fri, Jan 15, 2010 at 1:06 pm #

    If you do the arithmetic (a wifi transmitter is limited to 4W output, and the surface of a sphere is 4πr^2), it’s apparent that you’ll get a noticeable amount of charging only if you put the gadget next to the transmitter (at the very least, closer than a meter).

    At how many public hotspots do you even know the location of the transmitter, let alone have close physical access to it? Cute idea, but I don’t see much of a future for it.