Shure E3c-n Sound Isolating Earphones (Black) Superior sound quality for 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 Studio grade, low mass, high energy micro-speakers employ balanced armature technology for more efficient output and extended high frequencies Compatible for use with 1/8 inch (3.5 mm) audio output ports Form-fitting earpieces that stay securely inside the ear without uncomfortable headbands - includes personal fit kit with alternate sizes, styles