Plantronics HW251 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, Quick Disconnect feature for added freedom and Supports all Plantronics amplifiers and USB-to-headset adapters Working with the latest in wideband VoIP technology, the Plantronics SupraPlus Wideband headset delivers the highest level of audio performance even in noisy environments. The SupraPlus Wideband helps overcome the challenges posed by traditional technology, delivering heightened speech clarity and life-like fidelity