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The Koss QZ2000 are active noise cancelling headphones.

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The Koss QZ2000 are active noise cancelling headphones. The QZ2000 model is the top of the QZ noise cancelling product line, both in price and in technical specifications.  Designed to reduce the impact of environmental noise, these headphones cancel out low frequency noise below 1,000 Hz an average of 10 dB and noise below 200 Hz by 15 dB. The headphone folds up and come with a carrying case. A green LED light shines when the headphones are operating properly. The light turns red when there are 30 hours of listening use left on the batteries.  A 2 pin adapter is included to allow the headsets to be used on an airplane.  The headphones come with a lifetime, no questions asked warranty.

Features
  • Frequency Response is 15 - 20,000 Hz
  • Impedance is 5k ohms
  • Sensitivity is 101 db SPL/1mW
  • Distortion is
  • Cord is 4 feet long, straight with dual entry
  • Comes with a case
  • Includes 2 pin adaptor for airline in-flight entertainment
  • Uses 2 'AA' batteries, which are included
  • Batteries provide 200 hours of use
  • Battery warning light appears when there is 30 hours of use remaining
  • Lifetime Warranty
  • Folding headphones
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