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Koss unveils less pricey Bluetooth headphone
Amazon.com: Koss BT221i Wireless Bluetooth Ear Clips, In-Line Microphone, Volume Control and Touch Remote, Sweat Resistant, Black : Electronics
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Porta Pro® Wireless Bluetooth® Headphones - Koss Stereophones
Koss Porta Pro Wireless Review — STOZZ AUDIO
Amazon.com: Koss BT539iK Wireless Bluetooth Over-Ear Headphones,On-Board Microphone and Touch Controls, Detachable Cord Included, Dark Grey and Black : Electronics