This is a bundle package Jabra BIZ 2400 II Mono Noise Canceling (NC) headset bundle with a GN1200 bottom cord.  The new Jabra Biz 2400 II now has acoustic shock hearing protection and extra padding built in the headband as well as the only headset with a 360 swiveling boom mic. When the microphone is close to the mouth of the user, there is a risk of respiratory noise. Jabra Biz 2400 II mono direct connect headset microphone has little tiny holes instead of one larger hole for improve noise canceling. In addition foam inside of the microphone, reducing the penetration of air shocks to improve voice quality. 

Key Features:

• This package include the GN 1200 Smart Cord
• Specially engineered for telephones with RJ-9 modular headset jacks. (marked with the word "headset" or have a symbol of a headset).
• Noise Canceling (NC) Microphone
• Larger leatherette ear cushions than the previous model
• Kevlar-reinforced cord.
• A 360 degree swivel boom microphone
• High-definition sound with HD Voice and get crystal clear, communication.
• 3 year Jabra warranty

For more information, see Jabra Biz 2400 II datasheet