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The UR21 is a portable headphone used on-the-go. Portable headphones tend to be smaller, more lightweight, and may have features that lend themselves to listening on-the-go, like carrying cases or collapsible headbands.
Frequency Response: 40-20, 000 Hz;
Dynamic element for extended frequency response;
Closed leatherette ear cushions for maximum isolation and deep bass;
Adjustable headband for best fit;
Straight, single entry 4 ft. cord.