Sony h.ear on 3 Wireless NC Help Manual page 116

Help Guide
Wireless Noise Canceling Stereo Headset
h.ear on 3 Wireless NC (WH-H910N)
Unable to turn on the headset.
Make sure the battery is fully charged.
The headset cannot be turned on while charging the battery. Remove the USB Type-C cable and turn on the
headset.
Related Topic
Charging the headset
Checking the remaining battery charge
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