Key Features and Benefits, 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 responseimproves 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 anew 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 whatÆs going on around you, inaural cuts out distracting background noises, Voice TubeÖand noise-canceling, microphonesVoice tubes are lightweight and unobtrusive,and noise-canceling microphones allow clearconversations in noisy environments,H-Series or PolarisÖmodels, or compatibility with Plantronics amplifiers,USB-to-headset adapters, headset-ready phones and agent consoles.