AUDAC APM Bedienungsanleitung Seite 28

The volume for the Microphone can be adjusted by pressing the "Mic" button and
pressing the "+" and "-" buttons for increasing or decreasing the volume. To test if
the delected volume is correct, you can press the orange "Test" button, whereafter
the voice speaking into the microphone will be heard.
After the volume settings for both Chime and Microphone are made correctly, you can
return back to the regular operation mode by pushing both "EXIT" (The "Select All"
and "Deselect All") buttons at the same time.
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