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KOSS PortaPro: Bluetooth Edition : r/techsupportmacgyver
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Troubled Milwaukee headphones maker Koss Corp. looks to lure listeners with new wireless bluetooth Koss BT540i headphones - Milwaukee Business Journal
Amazon.com: Koss Porta Pro Wireless Bluetooth On-Ear Headphones, in-Line Microphone, Volume Control and Touch Remote, Adjustable Headband with Multi-Pivoting Ear Plates, Black : Electronics