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The Koss QZ77 are both active and passive noise cancelling headphones.

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The Koss QZ77 are both active and passive noise cancelling headphones. The QZ77 model is just below the QZ2000 in the QZ noise cancelling product line, both in price and in technical specifications. For a lower priced model, try the Koss QZ5. 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 passive noise reduction is a achieved through the design of the expandable cushion surrounding the earbud. The cushion is designed to expand and absorb excess noise.   The headphones come with a lifetime, no questions asked warranty.

Features
  • Frequency Response is 10 - 20,000 Hz
  • Impedance is 16k ohms
  • Sensitivity is 110 db SPL/1mW
  • Distortion is
  • Cord is 4 feet long, straight with dual entry
  • Uses 1 'AAA' battery
  • Lifetime Warranty
  • Earbud Design
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