that it doesn’t fill the air with electromagnetic radiation, as Tesla’s system did, but rather uses magnetic resonance, which essentially only allows the electricity sent to power a device specially “tuned” to receive it. This use of magnetic fields targeting appropriately chipped electronics helps these devices to sidestep known problems with wireless transmission via electric fields, which have a long range but poor aim, enveloping everything in a thick, invisible haze of electromagnetic radiation.
look into this
