Plantronics H81N User Guide - Page 19
Noise-Canceling Models, Standard Models - noise canceling
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ADJUSTING THE MOUTH PIECE Standard Models Hold the receiver securely against your ear with one hand. With your other hand, adjust the voice tube so that the tip sits two finger-widths from the corner of your mouth. To prevent breath noise, avoid positioning the voice tube in front of your mouth. Noise-Canceling Models Carefully shape the boom with both hands as shown. Do not bend or twist the boom within 1⁄2 inch of the microphone. 2" 50.8 mm Position the boom so that the microphone sits two finger-widths from the corner of your mouth. Make sure the front of the microphone faces your mouth. If necessary, carefully rotate the microphone into the proper position. Avoid repeated twisting of the boom. To temporarily move the NoiseCanceling microphone boom away from your mouth, rotate the boom grip. To return the boom to its original position, reverse the rotation. Front Back english