Plantronics Blackwire 3310 User Manual page 5

Position the boom
This headset can be worn on the left or right side.
Rotate the boom to align with your mouth.
CAUTION
To avoid breaking the boom, only rotate it up and over 180°.
Adjust the boom
Gently bend the boom in or out so it is approximately two finger widths from the corner of your
mouth.
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