Phonak Campus SX User Manual page 28

Mute the microphone which is attached to
the Campus SX (see page 22). If you want to give
comments to the children in parallel to the other
audio input, deactivate the mute function and
talk into the microphone.
Since Campus SX uses the microphone cable as
!
an antenna, unwind the microphone cable for an
optimal operating range.
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