We haven't had a chance to fully test this product yet, but we've assembled this helpful overview of relevant information on it.

The Koss PRO4AA circumaural headphones collocate noise-isolating functionality, a padded rubber headband, cushioned ear pads, and an 8-foot coiled cable. Additional features include a 10 – 25,000 Hz frequency response, 95 dB/mW sensitivity, and 250 ohms nominal impedance.

Features List:

  • Circumaural design
  • Noise-isolating functionality
  • Padded rubber headband
  • Cushioned ear pads
  • 8-foot coiled cable
  • 10 – 25,000 Hz frequency response
  • 95 dB/mW sensitivity
  • 250 ohms nominal impedance

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