Mono (Monaural), Noise Canceling Microphone, 8 ft. Cable, On-the-Ear, Light Weight - for Education - Voice Recognition, Speech Dictation, Distance Learning - Command and Control - Internet Chat - Skype - Certified 6 Dragon rated. The Andrea NC-181 Headset is an on-ear mono PC headset. The dual sided adjustable headband is designed to be durable while providing a stable and comfortable fit, even for smaller heads. Andrea's high quality 40 mm speaker driver provides the best audio in an education headset. As with all Andrea headsets, the NC-181 incorporates Andreas 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.