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.