Brand new Koss Sporta Pro On-Ear Portable Headphones Black ref/365/am/ey Listen wirelessly to your favourite music 17 hours of wireless listening with built-in rechargeable battery Bass boost function for dynamic bass sound(on/off) Voice-assistant compatible Swivel design Integrated remote & mic for smartphones located on headphones Frequency Response 20-20,000Hz Transmission Area Approx. 10m Driver Unit 30.7mm Nominal Impedance 32ohms

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