Here's how the iphone13pro charges its headphones.
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Put the headphones into the headphone case
Before charging the iPhone wireless headphones, put the iPhone wireless headphones into the headphone case.
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two
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Connect charger plug
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Plug the iPhone charger into the socket, and then plug the other end of the charger into the earphone case.
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Turn on the headphone case and look for the light
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After plugging in the power, open the box of the Apple wireless headset and see whether the charging display light inside is on. If it is on, it means that the headset is charging.