Austrian Audio Hi-X65; open studio headphones; circumaural; All metal hinges and bow for maximum durability; foldable construction for easy transport; frequency range: 5Hz to 28kHz; sensitivity: 110 dBspl/V; THD (@ 1kHz): <0.1%; impedance: 25 Ohms; nominal power handling: 150 mW; incl. detachable cables (3 m and 1.2 m); connector plug: 3.5 mm incl. adapter to 6.3 mm; dimensions: 200 x 170 x 85 mm; weight (without cable): 310 g