Charging by earphone charging box: The general Bluetooth earphone (split) will come with a charging box, which in addition to having the function of storing and protecting the earphone, can also charge the earphone. When our earphone is out of power outdoors, we can use the remaining power inside the earphone box to charge the Bluetooth earphone.
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2, the use of mobile phone reverse charging: many mobile phones now support wireless backcharging, if the headset and headset box are out of power at the same time, you can put the headset inside the box, and then use the wireless charging function on the back of the phone to re-charge the headset.