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Charging
When the headset is low, the red light will blink. Please charge it
immediately. About 2 hours after charging, when the red light is off and
the blue light is on, the battery is fully charged.
Charge Connections
Connect to the headset through the Type-C connector of the Type-C
charging cable.
Plug the charging cable into a USB charging port, with USB head
connected to USB charger (car charger, travel charger, computer USB,
etc.)
Note:
Charge the RKING4000 at least once every two months when not in use.