Headset cannot be charged or charging time is too long.


  • Make sure the headset units are stored securely in the supplied charging case. If the headset units are floating in the charging case, the headset units may not be charged.

  • Be sure to use the supplied USB Type-C cable and check that the cable is firmly connected to the charging case.
  • When the charging ports of the headset units or the charging case get dirty, the headset units may not be charged. Clean the charging ports with a soft dry cloth. For details, see “Maintenance”.
  • The left or right headset unit works as the main headset unit, so it consumes the rechargeable battery faster than the other unit. There is a difference in charging time between the left and right headset units, but this is not a malfunction.
    The left or the right headset unit can be the “main headset unit” depending on the usage environment.
  • It is recommended to charge in a place with an ambient temperature between 15 °C and 30 °C (59 °F - 86 °F). Charging outside of this range may result in less efficient charging.
  • While charging, be sure to keep the charging case lid closed to prevent the battery of the charging case from being wasted.
  • Reset the headset.
  • Initialize the headset, and pair the headset and the device again.

When charging with a USB AC adaptor

  • Make sure that the USB AC adaptor is firmly connected to the AC outlet.
  • When using a commercially available USB AC adaptor, use one capable of supplying an output current of 0.5 A (500 mA) or more.

When charging with a computer

  • Check that the USB Type-C cable is firmly connected to the computer.
  • Check that the computer is turned on. Wake the computer up if the computer is in standby (sleep) or hibernation mode.
  • Check that the charging case and the computer are directly connected and not via a USB hub. Also, this may be improved by restarting the computer and trying the USB connection again.
  • There may be a problem with the USB port of the connected computer. Try connecting to another USB port on the computer if one is available.
  • Update the OS of the computer.

When performing wireless charging

  • When charging wirelessly, charging may slow down or stop if the charging case becomes misaligned with the wireless charger.
  • When charging wirelessly, charging may slow down or stop at high or low temperatures depending on the wireless charger you are using.