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KOSS Red RUK 40R 3.5mm Connector Supra-aural On-ear Headphone

  • 20Hz–20KHz
  • 3.5mm Connector
  • 4ft Cord Length
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Koss RUK40 on-ear headphones are lightweight headphones that pack the robust Sound of Koss. Utilizing dynamic elements that deliver a smooth bass with a wide frequency response, the RUK40 is anything but your standard on-ear headphone. Available in a variety of color combinations, the RUK40 shows off your own style while you enjoy music the way it was meant to be heard.

Pivoting ear cups and uniquely cushioned pads are designed to ensure maximum comfort. Intended for extended use, these lightweight on-ear headphones will allow you hours of enjoyment. The unique flat, tangle resistant cord on the RUK40 keeps the focus on the music.

Learn more about the Koss RUK 40R



General SPEC

Frequency Response
Input Impedance
36 ohms
98 dB/mW
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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