I have buy at least three set of these and really like they . I be very fussy and have look at lot of ear bud , but keep come back to the Sennheisers . the sound quality be excellent , with plenty of volume . the bud be very comfortable . the cord be the perfect length for I -lrb- approx 3 ft -rrb- . the volume control on the cord be very handy . I particularly like the case . I have a pair of Sony earbud whose cord become a tangled mess in no time . the sennheiser come with a ingenious compact plastic case that reel in the cord quickly and easily . here be the spec from the package : Freq . Resp . 18 - 22k hz , Imped . 32 ohm , Max SPL 119bd -lrb- @ 1 khz 0.5 vrm -rrb- .