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"Koss JR900s are the music lover&rsquo;s answer to true stereo and cordless freedom. Operating on one of the highest power bands available on the market, the Koss JR900 headphone system (consisting of a high quality, battery operated RF transmitter with AC adapter) offers the best in wireless audio technology, allowing you to roam freely over a 70,000-square-foot area. From room to room, inside to outside, even in bright sunlight, you can move to your heart&rsquo;s content without the need for additional transmitters or worry of signal breakup."
<https://cs-cart.webkul.com/mve/electronics/mp3-players/headphones/jr900-wireless-headphones/?currency=GBP>