enable stealth mode
A voice prompt ("stealth mode on" or "stealth
mode off") or tone always confirms change to
stealth mode status.
Note: When using stealth mode, it is essential
that the stealth mode sensor is placed correctly
and is in contact with the ear canal (see step 3
on page 12). It is normal for the sound of your
voice to be less "natural" in stealth mode.
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