Jabra BIZ 1900-1920 Mono Telephone Headset, QD Connect, Noise Canceling Mic Noise Canceling Microphone reduces unwanted background noise and the noise-canceling microphones reduce unwanted background noise and are ideal in crowded and noisy, open office environments. HD Voice - High quality audio for crystal clear conversations Enjoy high-definition sound with HD Voice and get crystal clear, intelligible communication Talk in Comfort - Assure total comfort with a wide range of styles that match your individual needs and personal fit requirements. Peak Stop - Peak Stop technology immediately removes potentially harmful loud sounds or tones before they reach your ears and keeps the sound level within the safe range to protect your hearing.