*Discontinued* Replaced by Jabra Biz 2300 QD Mono Direct Connect Headset 

GN 2120 Flex series noise canceling headsets are ideal for demanding applications, especially noisy environments. They incorporate a flexible boom which ensures correct microphone positioning, and a noise-canceling microphone that filters out distracting background noise. They're lightweight, very durable, and extremely comfortable, even if worn all day long. A click-stop headband provides a customized fit and pillow-soft ear cushions rest gently over the ear. 

Key features:

• Specially designed for telephones with modular Headset jacks built-in the telephone. (marked with the word "headset" or have a symbol of a headset).
• This headset includes the GN 1200 Smart Cord
• Noise-canceling and ultra-noise-canceling options available for demanding environments
• BroadBass speakers
• DuraFlex II cable and boom
• Excellent combination of durability and quality
• Only compatible with modular headset jacks

For more details see GN Netcom 2120 datasheet