With Innovative Wideband Voip Technology, The Supraplus Headset Delivers Superior Audio Performance Improving Speech Clarity, Resulting In Decreased Errors, Repeats, And Listener Fatigue. Headset Is Designed For All-Day Wearing Comfort - Even For The Most Phone-Intensive Applications. A Wider Receive-Side Frequency Response Band, Intelligent Flexible Boom And Stylish Design All Bring Greater Audio Accuracy And Headset Flexibility To The Contact Center Or Office Professional. Ultra Noise-Canceling Microphone Provides Industry-Leading, Background Noise Reduction And Echo Performance While The Monaural Wearing Style Is Reversible For Wearing Over Either Ear. Quick Disconnect Feature Easily Connects To Vista M22 Audio Processor (Required) For Superior Call Clarity For All Communications, Including Wideband Voip. Headset Requires An Adapter Or Audio Processor (M22)..