Professional studio headphones. Dynamic studio headphones. Circum-aural closed headphones. Self-adjusting headband for optimum fit. Driver unit: 40 mm. Impedance: 40 ohms, +/- 15%. Sensitivity: 100 dB, +/- 3 dB. Frequency response: 10 Hz to 22 kHz. Weight: 295 g, +/- 10 g. Color: black. Reduction to 3,5 mm jack is not included.