[Graham M]

Basically as I understand it, there's a coil in a base station emitting a magnetic field, now, a transformer (like how you currently charge your phone) drops the voltage by putting two of these coils within close proximity with one having less winds on the coil than the other - this technology is basically doing the same thing over a larger distance. This theory would require some sort of receiver with a coil in it connected to the device to be charged (or possibly built-in as new tech arrives on the market)