The E4c earphones grew out of the realization that Shure’s sound isolation technology used by the professional audio industry was a perfect crossover for the rapidly expanding portable media devices market. The simple cylindrical form, size and cable exit angle of the E4c earphones allow them to be positioned at an ideal ergonomic angle for comfort and acoustic performance, which has received a high customer satisfaction rating. The clean geometric forms and combination of finishes and materials also establish a simple yet sophisticated technological language. The E4c earphones have exceeded Shure’s sales expectations.