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Amazon.com: Koss Porta Pro with Microphone and Remote On-Ear Headphones, in-Line Microphone and Touch Remote Control, Collapsible Design, Wired with 3.5mm Plug, Black and Silver : Electronics
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Amazon.com: Massdrop x Koss Porta Pro X On-Ear Headphones — Noise-Cancelling in-line Microphone, Activate Voice Assistant or Skip Tracks with in-line Remote, Collapsible for Maximum Portability (Midnight Blue) : Electronics
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Amazon.com: Customer reviews: Koss Porta Pro KTC Ultimate Portable Headphone for iPod, iPhone and iPad
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Koss's PortaPro KTC Headphones Are Sick, Sexy, Vintage And Ready For Your iPhone [Review] | Cult of Mac
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