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1, back charging is wireless charging, iPhone13 pro max is fully support wireless charging. For wireless charging, connect the USB-C port on the MagSafe charger to an AppleUSB-C power adapter of 20 watts or higher or a compatible third-party USB-C adapter.
2. It can also be connected to a USB-C port on a Mac or PC. Place the MagSafe charger face up on a flat surface, making sure there are no metal or other foreign objects nearby. Then place the phone on the MagSafe charger with the display facing up to charge it wirelessly.