Shure E3 Sound Isolating Earphone Stereo Headphone Smallest of Shure E-series Weighing only 0.9 ounce - less than 1 ounce Instead of bulky headphones, E3 wearers get form-fitting earpieces that stay securely inside the ear without uncomfortable headbands Sound isolation prevents outside noise from interfering with the music, and creates a quiet space for exceptional audio clarity The 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