No compromise, high-performance noise-isolating earphones that deliver best-in-class benefits at an affordable price. These comfortable wearing earsets reduce external sounds by about 35-42 dB which surpasses even active noise cancellation systems (for comparison, the Koss blocks about 8-12 dB). These fill that silence with an extended high frequency range and an excellent deep bass response. The overall fidelity of sound reproduction will amaze you. Includes nylon travel pouch, three pairs of replacement eartips (3-Flange, Foam and Glider styles), adjustable keeper-clip, filter removal tool and replacement filters. 48” cord, 1/8” (3.5mm) headphone jack.