Sony h.ear on 3 Wireless NC Help Manual page 125

Help Guide
Wireless Noise Canceling Stereo Headset
h.ear on 3 Wireless NC (WH-H910N)
The noise canceling effect is not sufficient.
Make sure that the noise canceling function is turned on.
Adjust the headset into a comfortable position.
The noise canceling function is effective in low frequency ranges such as airplanes, trains, offices, near air-
conditioning, and is not as effective for higher frequencies, such as human voices.
Related Topic
What is noise canceling?
Using the noise canceling function
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