Plantronics HW251N SupraPlus Monaural / Single Ear - Voice Tube - Wideband VoIP Headset offers more natural sound with wideband telephones and Premium audio quality and comfort for office and contact center professionals, Noise-Canceling microphone for reduced background noise, Flexible microphone boom, Quick Disconnect feature for added freedom and Supports all Plantronics amplifiers and USB-to-headset adapters