Plantronics Duopro behind-the-head headset with clear voice tube DuoPro® Behind-The-Head Headset with Clear Voice Tube 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.