The Venerable Koss Porta Pro

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With its unique D-profile design and precision tuned sound, the Koss UR23i full size headphone is ideal for personal listening. Isolation from ultra-soft cushions and closed back design brings you closer to the music. Durable lightweight design makes the Koss UR23i a great portable headphone for traveling. Answer calls, play, pause, or skip tracks with the UR23i's in-line one touch microphone.

Koss Porta Pro Limited Edition On-Ear Headphones, In-Line Microphone, Volume Control and Touch Remote Control, Retro Style, Includes Hard Carry Case

Koss Porta Pro Classic Headphone Review - Venerable Vibes

Koss - Founder John C. Koss wearing the acclaimed Porta

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The Venerable Koss Porta Pro Page 2

Koss Porta Pro Limited Edition review - SoundGuys

Wireless version of the classic Koss Porta Pro headphones could be on the way [Updated]