Advanced build quality and engineering 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils Type : Closed-back Dynamic Driver : Diameter 40 mm Frequency Response : 15 - 22,000 Hz Maximum Input Power : 1,300 mW et 1 kHz Sensitivity : 96 dB Tuned for enhanced detail, with excellent mid-range definition Circumaural design contours around the ears for excellent sound isolation in loud environments Convenient single-side cable exit Collapsible for space-saving portability