The SupraPlus® Monaural and Binaural noise-cancelling models have all the features of standard SupraPlus® headsets, but also use noise-cancelling microphones which eliminates up to 75% of all background noise. As with all Plantronics office headsets, the SupraPlus® features Plantronics patented Sound Guard Plus and Call Clarity technology. Its easy to use Quick Disconnect feature places the caller on hold, while allowing users to leave their desk without removing their headset. Its optional noise-cancelling feature is ideal for use in situations where background noise interferes with clear.