Supra is one of the world's best-selling headsets because it combines superior sound quality with both durability and comfort. Its fully adjustable headband design provides excellent stability and outstanding comfort. For environments where you really need to concentrate on a call, the Supra Binaural headset, with sound in both ears is ideal. Alternatively, to confer with colleagues while on a call, the Supra Monaural headset, with sound in one ear, allows flexibility while on the telephone. The Supra Monaural and Binaural noise-cancelling models have all the features of standard Supra headsets, but also use noise-cancelling microphones which eliminates up to 75% of all background noise. As with all Plantronics office headsets, the Supra 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 communications.