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Porta Pro® Communication Headsets - Koss Stereophones
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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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Porta Pro® Mic/Remote On Ear Headphones - Koss Stereophones
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Porta Pro® Wireless Bluetooth® Headphones - Koss Stereophones
