Plantronics HW261N Binaural Headset 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 (not included). Plantronics offers monaural or binaural versions with either voice tube or noise-canceling microphones. Plantronics "QD" 4-pin quick connect/disconnect.