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Amazon.com: Customer reviews: Koss SPARKPLUG - Stereo In Ear Ear Plugs (Discontinued by Manufacturer)
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KOSS The Plug Wireless Bluetooth in-Ear Buds, in-Line Microphone and Remote, Noise Isolating Memory Foam Cushions, Black : Electronics - Amazon.com
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Amazon.com: Koss GMR-545-AIR USB Over-Ear Gaming Headphones, Two Cords with Microphone Included, Open-Back Design, Wired with USB Plug, Black : Video Games
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