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Koss RUK20

In-ear headphones (Blue/Pink)

Item # 245RUK20LP

This item is no longer available.

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Our take on the Koss RUK20

Fun earbuds to keep in touch with your music

Looking for an inexpensive pair of earbuds to take everywhere? The Koss RUK20 in-ear headphones are easy to keep in your pocket, purse or bag so you can enjoy music on your portable device anyplace and anytime. The RUK20 comes with three different-sized ear tips to help you find the right fit, so they block out noise and seal in sound for optimum bass response and clarity. Available in a variety of colors, choose your style and keep in touch with your music wherever you go.

Product Highlights:

  • includes three pairs of silicon ear tips for optimum comfort and noise isolation
  • 4-foot miniplug cable
  • frequency response: 16-20,000 Hz
  • sensitivity: 110 dB
  • impedance: 16 ohms
  • warranty: lifetime
  • Our 60-day money-back guarantee

What's in the Box:

  • Blue/pink/green earbud headphones with attached 4' cord (3.5mm plug)
  • 2 Medium pink silicone tips (installed)
  • 2 Large pink silicone tips
  • 2 Small pink silicone tips
  • Limited Lifetime Warranty sheet

Hands-on research

Features and Specs

Fit Style In-ear/Earbud
Earcup Type Closed
Earcup Width x Height 0.492" x 0.492"
Noise-canceling No
Bluetooth No
Mic For Taking Calls No
iPhone Control ---
Lightning Connector No
Android Control ---
Frequency Response 16-20k Hz
Sensitivity 110 dB
Impedance 16 Ohms
Weight Not Given
Cord Length 48"
1/4-inch Adapter Included No
Volume Control No
Parts Warranty Lifetime
Labor Warranty Lifetime

Product Research


Overview: The Koss Rukus-series RUK20 features unique color combinations for expressing your own personal style. These noise-isolating in-ear headphones block exterior noise so you can hear your music clearly, without outside interruption.

Silicone Tips: The RUK20s come with three sizes of silicone ear tips (small, medium, and large) for a comfortable fit.

Cord: The headphones have a 4' straight cord with a slender 3.5mm straight plug. The small diameter plug design can be easily plugged into recessed headphone jacks or when the smartphone or digital music player is contained in a hard case.

Warranty: The RUK20s are covered by the Koss Stereophones Limited Lifetime Warranty.


  • Frequency Response: 16Hz-20kHz
  • Sensitivity (dB/1mW): 110dB
  • Nominal Impedance: 16 ohms

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.