Sony h.ear on 3 Wireless NC Help Manual page 131

Help Guide
Wireless Noise Canceling Stereo Headset
h.ear on 3 Wireless NC (WH-H910N)
The headset does not operate properly.
Reset the headset. This operation does not delete pairing information.
If the headset does not operate properly even if you reset the headset, initialize the headset.
Related Topic
Resetting the headset
Initializing the headset to restore factory settings
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