DESC: Unique anti-twist boom ensures noise-canceling microphone stays properly positioned. All models available with voice tube or noise-canceling microphone. Adjustable double T-pad headband, earloop and clothing clip provide all-day comfort. Reduces background noise and incoming loud tones while enhancing call clarity. Advanced speaker technology for optimal clarity. Speaker pad balances off the ear for clear sound without pressure. Global Product Type: Headsets-Monaural; Headset Type: Monaural; Headset Style: Convertible; Earpiece Type: Adjustable Earloop.