The new standard in all-day comfort and reliability SupraPlus expands on the classic corded,professional headset style and functionality, Improved receive-side audio quality, A greater receive-side frequency response improves listening intelligibility, Comfortable, lightweight design, Adjustable headband, foam ear cushions and comfort T-Pad design create a stable, comfortable fit, Bendable click-stop microphone boom,Stays in position for clearer voice transmission, Smaller, lighter, more flexible cable, Designed for lightweight durability, with a new single-cable design for binaural models, Quick call feature,Headband twists out of the way for convenient quick call pick up, Monaural or binaural styles,Monaural lets you hear the conversation and what�s going on around you, inaural cuts out distracting background noises, Voice Tube�and noise-canceling, microphones Voice tubes are lightweight and unobtrusive, and noise-canceling microphones allow clear conversations in noisy environments,