Shure E4c-n Sound Isolating Earphones (Black) Highest quality audio experience with your Black ipod Nano or other black MP3 or Sony PSP. Sound Isolating in-ear design provides exception clarity - you hear only what you want to hear Dual high-energy micro in-ear speakers with in-line crossover to enhance studio-quality listening Portable and lightweight design - weighing just over one ounce Personal fit kit to contour to your ear size - earphones won't fall out while you're exercising.