Zeromic STHD-F1, Инструкция по эксплуатации

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Press the volume button, you can adjust the volume.
(when you power on the Zeromic, volume is settled
the 1/2 of maximum volume.)
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Headset Volume increasing [ ▲ ]
Pressing ▲ , the volume increased.
Continuously press ▲ , continuously increases the volume.
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Headset Volume decreasing [ ▼ ]
Pressing ▼ , the volume decreased.
Continuously press ▲ , continuously decreases the volume.
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Headset volume adjustment of standard volume [ ▲ ] + [ ▼ ]
Pressing ▲ and ▼ , go back to the standard volume.
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The volume confirmation tone
Increasing the volume, (880Hz) of soprano tone, reducing the
volume, (440Hz) of bass tone can be heard.
In addition, increasing to the maximum volume, (1760Hz) of
soprano tone, when return to the standard volume, 1000Hz of tone
can be heard.
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