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P/21 vs Porta pro(Yaxi) the 40$ fight of Koss (Long review in coms, and will answer any questions!) : r/headphones
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Amazon.com: Koss Porta Pro Double-Sided On-Ear Communication Headset, Flexible, Hands-Free Electret Microphone, Collapsible Design, Wired 3.5mm TRRS Plug, Black : Electronics
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