Unitron Quantum Guide page 24

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DuoLink
If DuoLink is enabled, then changing the
volume, program or comfort-clarity settings
on one hearing aid, will automatically make
the change to both hearing aids at the same
time. DuoLink works for the push button and
the rotary dial or scroll wheel.
For example, if your push button is configured
as a program control and DuoLink is enabled,
when you push the button on your right
hearing aid, the program will change in both
hearing aids.
Learning
Your hearing aids will learn your adjustments
in different environments, if this feature is
available and has been enabled by your
hearing healthcare professional. Over time,
the hearing aids will adjust the default volume
and comfort-clarity settings to the levels that
you typically use.
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