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The Koss Porta Pro® Communication Headset features a flexible, hands-free microphone and connects to devices through a simple 3.5mm TRRS plug.
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Since John C. Koss in 1958 the first legendary stereo headphones SP/3 on the market, were Koss headphones designed to the fascination of live and studio recordings almost without loss. The precision of the sound playback appreciate music lovers all over the world as the sound of Koss.This text is machine translated.
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🔶 Koss Porta-Pro - [Official] Open Back - HifiGuides Forums