Wideband audio for more natural sound and clearer conversations * Fully compatible with standard band environments * Premium audio assures quality customer communications * Ultra noise-canceling screen out background noise, reducing distraction * Over the head, all-day comfortable design for intensive use * The SupraPlus brings new standards in all-day comfort and reliability to telephone professionals * Enhanced receive-side audio quality, intelligent flexible boom and stylish design provide greater headset flexibility * Must be used with a Plantronics USB-to-headset adapter or headset amplifier * Plantronics offers monaural or binaural versions with either voice tube or noise-canceling microphones