Sony h.ear on 3 Wireless NC Help Manual page 117

Help Guide
Wireless Noise Canceling Stereo Headset
h.ear on 3 Wireless NC (WH-H910N)
Charging cannot be done.
Be sure to use the supplied USB Type-C cable.
Check that the USB Type-C cable is firmly connected to the headset and the USB AC adaptor or computer.
Make sure that the USB AC adaptor is firmly connected to the AC outlet.
Check that the computer is turned on.
Wake the computer up if the computer is in standby (sleep) or hibernation mode.
When using Windows 8.1, update using Windows Update.
Related Topic
Charging the headset
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