Excellent passive noise isolation.Closed-back architecture provides excellent sound isolation.Speakers tilted to the ear's natural angle for clarity. Carefully tested drivers for the best balance sound.Earshell buttons for controlling music and calls.1.2 meter audio cable for when your battery runs out.1 meter USB charging cable for recharging.Two built-in microphones for improved call quality.Deluxe memory foam cushions for an ergonomic fit. Frequency response: 7 - 23 500 HzImpedance: 16 OhmSensitivity: 107 dB