SPECS HIFIMAN Operating principle: Open back Drivers: Nano Diaphragm planar magnetic drivers Magnets: Double sided Frequency response: 20 Hz – 20 kHz Sensitivity: 93.5 dB Impedance: 18 ohms Finish: Matte black with high-gloss black printing Headband: Spring steel with adjustable sliders Earpads: Hybrid Focus pads Laser-etched serialization Cable: 4.9 ft (1.5 m) stereo cable Termination: 3.5 mm Weight: 12.5 oz (355 g)