Stereo (Binaural), Noise Canceling Microphone, 8 ft. Cable, Over-the-Ear (Circumaural) Passive Noise Cancelling Ear Cups, for Education - Voice Recognition, Speech Dictation, Distance Learning, Command and Control - Internet Chat - Skype - Certified 6 Dragon rated. The Andrea NC-250V Education Headset is a full size circumaural (over-the-ear) stereo PC headset. The large leather-type ear cushions provide maximum comfort and are designed to fully seal against the head attenuating any intrusive background noise making it a perfect choice for an education or classroom environment. The in-line volume control allows you easy access to adjust the volume of the headset. The extra wide dual rib adjustable headband is designed to be durable while providing a stable and comfortable fit, even for smaller heads. Andrea's high quality 40mm speaker drivers with matched impedance provide the best audio in an education headset. As with all Andrea headsets, the NC-250V incorporates Andrea's acoustic noise canceling microphone technology with an adjustable flex boom allowing for the ideal microphone location and resulting in the highest voice recognition ratings in the industry making all the Andrea headsets the best choice for speech accuracy, voice recognition and speech intelligibility in the industry. Certified 6 Dragon rated.