Bose A30 - Page 20

IMPORTANCE OF PROPER FIT
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2. Make sure the microphone is 0.5" (12.7 mm) from your lips.
NOTE: The microphone should not be touching your lips.
0.5"
12.7 mm
3. Make sure the white dot on the microphone base faces your mouth.
NOTE: If needed, twist the microphone base.
4. Test the headset before flight.