AKG K-271 MKII Studio - stereo closed back dynamic headphones, circumaural design, 55ohms rated impedance, 200mW maximum input power, frequency range: 16Hz-28kHz, 104dB/V sensitivity, self-adjusting headband and auto-shut-off feature, single side jack, Includes 3mtr cable with 3.5mm stereo mini-jack plug, 5mtr coiled cable with 3.5mm stereo mini-jack plug, 1 pair of velvet pads and gold plated 1/8" to 1/4" screw-on adapter, Weight: 1kg (without cable)Â