German Engineering - Precision German engineered transducers ensure detailed, dynamic sound with exceptional balance and extended bass response. Smart Remote - The one button in-line smart remote conveniently provides play and pause for music and to take calls without needing to touch your phone. Personalized Fit - Three sizes (S, M, L) of silicon ear adapters are included to provide individualized fit for comfort and improved performance. Noise Isolation - The in-ear design effectively blocks ambient noise improving the listening experience.