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KOSS Blue RUK 40B 3.5mm Connector Supra-aural On-ear Headphone

  • 20Hz–20KHz
  • 3.5mm Connector
  • 4ft. Cord Length
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The KOSS RUK 40B on-ear headphone features dynamic elements for great stereo sound reproduction. The lightweight, comfortable design enables hours of music enjoyment without straining your ears and head. It’s available in an array of vivid colors: silver, blue, black, red, and tangerine.

  • newegg Superior sound Dynamic elements deliver smooth bass and a wide frequency response, making stereo sound reproduction realistic.
  • newegg Ultimate comfort This lightweight headphone features pivoting ear cups and uniquely cushioned pads, ensuring maximum comfort.

Learn more about the Koss RUK 40B



General SPEC

Frequency Response
Input Impedance
36 ohms
98dB S.P.L. at 1KHz
Ear Coupling
Cord Length


Lightweight on-ear stereophones

Dynamic elements deliver smooth bass and a wide frequency response

Uniquely designed cushioned pads for ultimate comfort

Pivoting ear cups

Flat, dual entry 4ft cord with 3.5 mm plug

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

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