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 & clothing clip provide all-day comfort. Reduces background noise & incoming loud tones while enhancing call clarity. Advanced speaker technology for optimal clarity. Speaker pad balances off the ear for clear sound without pressure. Headset Type: Monaural; Headset Style: Convertible; Earpiece Type: Adjustable Earloop; Earpiece Material: Foam.