Enjoy an audiophile listening experience when music matters. The E3c combines precision components and remarkable sound isolation to provide studio quality sound everywhere you go. High-energy micro-speakers deliver great tonal balance across the entire frequency range. Flexible sleeves produce remarkable isolation, revealing the subtle details of original recordings. The small compact earphone design fits securely in your ear, making it ideal for active listening and frequent travel. The E3c's ear sleeves can even be custom-fit by a hearing specialist, after your purchase, for the best-personalized fit and comfort.The E3c's in ear design naturally blocks background noise. This allows lower listening volumes in loud environments. No batteries or extra equipment are needed for sound isolation. The E3c's speakers are constructed with studio-grade components, with balanced armature technology, producing efficient output and exceptional audio clarity. The E3c's speakers have an extended frequency range for even greater clarity in your listening experience. Because every ear is different, E3c's earphones come with a pair of disposable foam sleeves, three pairs (small, medium, large) of flex sleeves, and three pairs of ultra-soft flex sleeves (small, medium, large) to ensure the ideal personalized fit. The soft, flexible sleeves in the Fit Kit gently contour the inside of the ear for a comfortable, secure fit. The E3c's are compatible with custom-molded sleeves, fit by a hearing specialist, for the ultimate in fit and comfort. The E3c's cables pass behind the ear - out of sight and out of the way - to provide a more comfortable, discreet fit. The E3c comes with a stylish, compact carrying case. The cable spool inside allows for an easy, tangle-free way to store your earphones.