Hello @suanik
Welcome to the Poly community.
The sidetone of our Blackwire series can be get adjusted via the Windows Sound Control panel. Please follow the following path to get to the setting: Windows Sound Control Panel>Playback>Double click the Blackwire>Levels>Sidetone.
Also on high sidetone levels, the headset's microphone may start picking up the environmental airflow and feeds it back to the speaker which results in an audible hissing sound.
Please note that the sidetone setting is not available if the Blackwire series are used with a Mac.
Best Regards,
Mukesh Kumar
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