Wireless charging can be used with a phone case.
But it can't be metal. The best distance of wireless charging is 2-4mm, the coil can not be directly close, so it is just the best distance between the mobile phone shell and the wireless charging shell.
Further information:
With the continuous improvement of power supply quality, safety, reliability, convenience, immediacy, special occasions, special geographical environment and other requirements of electrical equipment, the contact power transmission mode is increasingly unable to meet the actual needs.
Wireless charger is the use of electromagnetic induction principle of charging equipment, its principle and transformer similar, through the sending and receiving end of each placed a coil, the sending end of the coil under the action of power to the outside electromagnetic signal, the receiving end of the coil received electromagnetic signal and electromagnetic signal into the current, so as to achieve the purpose of wireless charging. Wireless charging technology is a special way of power supply, it does not need the power line, rely on electromagnetic wave propagation, and then the electromagnetic wave energy into electricity, and finally achieve wireless charging.