1. It's limited. 2. This is because wireless charging technology is realized through the principle of electromagnetic induction, and there needs to be a certain distance between RX (receiving end) and Tx (sending end) to be able to carry out electromagnetic induction and energy transmission.
If the distance is too far, the effect of electromagnetic induction will be weakened, and effective charging cannot be achieved. 3. In addition, the sensing distance is also affected by the power and design limitations of the wireless charging device. In general, the induction distance of wireless charging devices is between a few millimeters and a few centimeters.
With the continuous development of technology, wireless charging technology with further sensing distance may come out in the future.