Sennheiser HMD 46 Instruction Manual page 6

Positioning the microphone
Bend the flexible microphone boom so that the micro-
phone is placed at the corner of the mouth. Maintain
a distance of 2 cm between microphone and mouth.
Turning the microphone boom
The microphone boom can be rotated. This allows the
headset to be worn with the microphone boom posi-
tioned on either the left or right-hand side of the head.
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