Generally speaking, the wireless charging distance will be affected by the power inductance coil and the actual distance, the MIT (MIT) test of the resonator coil size is similar to the refrigerator coil size, but that can only support about two meters.
In general, the farther you want to transmit power, the thicker the coil requirements, but if it is too coarse, it is inconvenient for us to carry, so the key to solve the problem is to achieve the repeater resonance, so that "electric energy" from a repeater to jump to another repeater.
Now, for the sake of consumer safety and their convenience, researchers have provided near-magnetic wireless charging technology (which needs to be placed on the transmitter, but the charge distance is limited), and they are also studying long-distance wireless charging, which will be an emerging market.
In fact, the current technology can be achieved in the range of 3 feet $number feet to carry out effective power transmission, but this also requires the validation of relevant organizations. Believe that over the next 5-10 years, even faster, long-distance wireless charging will enter everyone's life.