Jabra's MPN: 
2409-720-209
  JABRA BIZ 2400 II Duo QD - Mic. 72 UNC
  At Jabra the answer's simple- we listen to the user. Over the last five years we've refined and improved the BIZ Series headset to not only keep ahead of a changing industry, but to define it.
   
  ULTRA NOISE CANCELLATION
  Ultra noise-cancelling microphone to eliminate background noise.
   
  HD VOICE + HIFI SOUND
  For crystal clear conversation.
   
  UNBREAKABLE 360 SPIN BOOM ARM
  For outstanding durability and optimum positioning.
   
  40% LIGHTER THAN COMPETING HEADSETS
  Super soft leatherette head and ear cushioning for a superior fit.
   
  PEAKSTOP™
  PeakStop™ instantly removes any harmful loud sounds before they even reach your ears. This keeps the sound level in the safe range and protects your hearing.
   
  TALK IN COMFORT
  Find the perfect fit with a range of light, ergonomically designed frames, soft ear cushions, adjustable headbands and microphone boom. Your headset will be comfortable all day long.
   
  HD VOICE / WIDEBAND AUDIO
  HD Voice lets you have lifelike, vibrant conversations. You won’t have to struggle to hear what the other person is saying.
   
  FREESPIN™
  You can rotate the boom arm 360 degrees without the risk of breaking it. Find the microphone placement that works for you.
   
  KEVLAR®-REINFORCED CORD
  Cords are built to last and reinforced with Kevlar®. They’re extremely durable and will take most daily punishment.
   
  MULTI-DEVICE CONNECTIVITY
  You can purchase a variety of different cords that let you connect to your smartphone or deskphone.
   
  NOISE-CANCELING MICROPHONE
  Noise-cancelling microphone reduces unwanted background noise and is ideal in noisy open-office environments. Ultra noise-canceling variant is also available.
   
  AIR SHOCK MICROPHONE
  Having the mic close to your mouth can cause unwanted breathing noise. To reduce this, we’ve designed the mic with many small holes and placed a layer of foam on the inside. This prevents most air shocks and improves call quality.
  Technical Specifications
  
    | Specifications
 | 
  
    | Audio Input
 | Uni-directional microphone
 | 
  
    | Colour
 | black
 | 
  
    | Connectivity
 | 2.0/3.0
 | 
  
    | Frequency Response
 | 
 Speaker Frequency Range:
 80 - 16000 Hz
 | 
  
    | Misc.
 |  | 
  
    | Product Type
 | corded
 | 
  
    | Technology
 |  | 
  
    | Warranty
 | 3 Years
 |