This is the Jabra BIZ 2400 II Mono 3-in-1 "Direct Connect" headset bundle comes with a GN1200 bottom cable.  GN 2400 II Mono 3-in-1 has an Ultra Noise Canceling Microphone - the best noise canceling available today. Jabra Biz 2400 II 3-in-1 has built-in acoustic shock protection, extra foam padding in the headband as well as the only headset with a 360deg swiveling boom mic. When the microphone is close to the mouth of the user, there is a risk of respiratory noise. The extra foam included on the inside of the microphone, reducing the penetration of air shocks to optimize the voice transmission quality. 

Key Features:

• Specially engineered for telephones with RJ-9 modular headset jacks. (marked with the word "headset" or have a symbol of a headset).
• Bundle package include the GN 1200 Smart Cord
• Ultra Noise Canceling Microphone - best noise canceling there is.
• Includes 3 different styles 3 wearing options. This model Includes an ear hook and behind the neck band as well as the over-the-head headband.
• 40% lighter
• Larger leatherette ear cushions
• Wide band quality speaker performance and noise cancellation microphone for the caller.
• 360˚ degree rotating almost "unbreakable" boom arm
• Kevlar-reinforced cables for years of use.
• 3 year Jabra warranty

For more information, see Jabra Biz 2400 II datasheet