Professional Studio Monitor Headphones, Blue And BlackClosed-back dynamic, Driver Diameter: 40mm Neo, Frequency Response: 15 - 28,000 Hz, Max Input Power: 1.6 mW at 1 kHz, Sensitivity: 99 dB, Impedance: 38 ohms, Weight 285g, Cable. 1.2-3.0 m,left-side exit, Acc. Included 6.3 mm (1/4') screw on adapter