Cisco Headset 531 (Wired Single with Quick Disconnect coiled RJ Headset Cable) - Mono - Quick Disconnect - Wired - 90 Ohm - 50 Hz - 18 kHz - Over-the-head - Monaural - Supra-aural - Electret, Condenser, Uni-directional Microphone - Noise Canceling

Electret microphone technology ensures maximum dependability and optimal performance Great for Audio/Visual Labs, Assisted Listening Systems and more that have a Mono jack for non-stereo use Noise cancellation effectively helps to boost your concentration and avoid background noise and distractions Sharp looking over head design will give you a comfortable fit Listen to deep lows and euphoric highs with a frequency range of sound from 50 Hz-18 kHz Wired connectivity technology delivers exceptional performance to offer maximum usability Boom microphone is designed in such a manner that it will never miss a word you say Features Quick Disconnect connector Effectively cancels outside noise to eliminate distortion with maximum sound efficiency