The Apple Watch uses a magnetic MagSafe plug to support Wireless charging technology (Wireless charging technology; Wireless charge technology, derived from wireless power delivery technology. Wireless charging, also known as inductive charging, non-contact inductive charging, is the use of near-field induction, that is, inductive coupling, by the power supply device (charger) to transmit energy to the power device, the device uses the received energy to charge the battery, and at the same time for its own operation.
Since the energy is transmitted by inductive coupling between the charger and the electrical device, there is no wire connection between the two, so the charger and the electrical device can be no conductive contact exposed. There must be pros and cons.