Jabra GN 2125 noise cancelling GN 2100 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. This model is a binaural headset (you hear through both ears) -- which improves audibility of weak voices and blocks out distracting ambient sounds and nearby voices. 

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
• ATL technology eliminates sound reverberations
• Convenient swing-away boom
• noise cancelling mirophone
• Full-size leatherette ear cushion
• Only compatible with modular headset jacks

For more details see GN Netcom 2125 datasheet