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/cdn.vox-cdn.com/uploads/chorus_asset/file/10774847/akrales_180502_2518_0120.jpg "Koss Porta Pro Wireless review: a classic mistake - The Verge")
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Koss unveils less pricey Bluetooth headphone
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Review: Koss Porta Pro Wireless are the classic headphones plus Bluetooth – Six Colors
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BT221i Bluetooth® Wireless Headphones - Koss Stereophones
