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The Koss QZ50 are active noise cancelling headphones.

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The Koss QZ50 are active noise cancelling headphones. The QZ50 model are mid-range in the QZ noise cancelling product line, both in price and in technical specifications.  Designed to reduce the impact of environmental noise, these headphones use a processor to actively reduce low frequency repetitive noise. The headband goes behind the head and has closed ear cushions to reduce ambient noise. Using one 'AAA" battery, the headphones have an approximate battery life of 50 hours.   The headphones come with a lifetime, no questions asked warranty.

Features
  • Frequency Response is 30 - 20,000 Hz
  • Impedance is 32k ohms
  • Sensitivity is 98db SPL/1mW
  • Distortion is
  • Cord is 4 feet long, straight with single entry
  • Uses 1 'AAA' battery
  • Batteries provide 30 hours of use
  • Lifetime Warranty
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