Austrian Audio Hi-X60; closed-back studio headphones; circumaural; all metal hinges and bow for maximum durability; foldable for easy transport; frequency range: 5 Hz to 28 kHz; sensitivity: 110 dB SPL/V; distortion (@1kHz): <0.1%; impedance: 25 ohms; input power: 150 mW; detachable cable 3 m and 1.2m included; connector plug: 3.5 mm including adapter to 6.3 mm; dimensions: 200 x 170 x 85 mm; weight (without cable): 0.320 kg.