Etymotic ER-6i earphones have been specially balanced to compensate for the higher frequency tendencies of compressed digital music giving you a full-bodied listening experience with your portable player. With a choice of flanged of foam eartips to give you the most comfortable fit and the best isolation, the ER-6i delivers crips and clear sound at all frequencies so you can listen safely and at the right level for you without being bothered by outside noise.