High quality headphones with rich bass, crystal clear high resolution and accurate sound field positioning. Now the new HD681 EVO upgraded version has a completely new, more slender shape and an improved smoother, more neutral, treble tone. Type: Dynamic, Semi-open, Driver:o50 mm, neodymium, Sensitivity:98 dB SPL (1mW), Frequency Response:10-30,000 Hz, Maximum Power: 300 mW, Rated Impedance:32 ? (copper-coated aluminum wire). Color: white