• 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 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. Talk in Comfort - Assure total comfort with a wide range of styles that match your individual needs and personal fit requirements. User manual included in package explains all models under GN2100 Series. Professional, lightweight, over-the-head, dual-ear style headset with latest SoundTube technology Swing-away microphone boom Click-stop, over-the-head headband, pillow-soft ear cushions For use with GN Netcom corded or cordless amplifiers