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The Koss QZ PRO are active and passive noise cancelling headphones.

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The Koss QZ PRO are active and passive noise cancelling headphones. The QZ PRO model are mid-range in the QZ noise cancelling product line, both in price and in technical specifications.  For a higher end product, try the QZ50 or the QZ2000. Designed to reduce the impact of environmental noise, these headphones use a processor to actively reduce low frequency repetitive noise. The active noise cancellation feature can be turned on or off with a switch. The headband goes behind the head and has closed ear cushions to reduce ambient noise.  These headphones can be folded and come with a 2-prong airplane adapter. The headphones come with a lifetime, no questions asked warranty.

Features
  • Frequency Response is 40 - 20,000 Hz
  • Impedance is 32 ohms
  • Sensitivity is 90db SPL/1mW
  • Distortion is
  • Cord is 4 feet long, straight with single entry
  • Includes 2 prong airplane adaptor
  • USes 2 "AAA' batteries for 30 hours continuous use
  • Lifetime Warranty
  • Passive noise canceling through fit of cushions around the ear
  • Active noise canceling located in the headset
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