Dynamic element for accurate sound reproduction. Closed ear cushion design for maximum isolation and deep bass. Volume control on each earcup for easy level adjustment from ear to ear. Heavy duty, 10 foot coiled cord for improved durability. Adjustable, vinyl-covered headband adapts to individual head size. Includes 1/8" and 1/4" stereo plugs for home and portable use. Frequency response: 20-17,000Hz.