Austrian Audio Hi-X55, Headphone, Closed studio headphones, Circumaural, Metal hinges and temples for maximum durability, Foldable for easy transport, Frequency range: 5 to 28,000 Hz, Sensitivity: 118 dB SPL / V, Total harmonic distortion (@ 1 kHz): <0.1%, Impedance: 25 ohms, Detachable cable, length 3 m, Connector: 3.5 mm including adapter to 6.3 mm, Dimensions: 300 x 170 x 85 mm, Weight (without cable): 305 g