With its high quality sound performance and enhanced bass, the KHP21v is ideal for listeners seeking headphones with a big sound that wears comfortably and travels light. The KHP21v is equipped with dynamic elements for an extended frequency response from 20-18,000 Hz. Anisotropic ferrite magnets mean the KHP21v 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. An inline volume control allows you to conveniently adjust the sound levels while listening.The KHP21v 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 KHP21v 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 (1/4") adapter are included.