Wireless charging uses the principle of electromagnetic induction, which operates at a very low frequency and does little harm.
< br >
Electromagnetic induction: A certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end. It is the first generation of mobile phone wireless charging, and the technology is mature, but it can only be single-to-single short-range charging (qi standard, within 1cm, within 5 watts), rather than single-to-multiple charging like WiFi. There is a strong electromagnetic field energy in the wireless charging area, and some coils are added here to induce voltage. The induced voltage can be converted into the energy received by the cell phone battery.