Great Sound Meets Lightweight Comfort With its high quality sound performance and enhanced bass the UR21 is ideal for listeners seeking headphones with a big sound that wears comfortably and travels light. The UR21 is equipped with dynamic elements for an extended frequency response from 40-20 000 Hz. Anisotropic ferrite magnets mean the UR21 can really turn up the volume even with low-voltage portable devices. Oxygen-free copper voice coils improve signal transmission and conduction for cleaner clearer sound. To improve bass performance block outside noise and minimize sound leakage closed leatherette ear cushions seal lightly around the ears. The UR21 features contemporary styling and a simple design. At just over six ounces these headphone wear comfortably even after hours of listening. The headband is adjustable to ensure a comfortable fit for any head size or shape. The UR21 includes a single-entry four-foot cord perfect for use with portables. A 3.5mm (1/8") plug L-shaped to minimize cord stress and a 6.3 mm (¼") adapter are included. Listeners seeking great sound in lightweight package will cheer the UR21.