Headphone TypeDynamic, closed Magnet TypeNeodymium Driver Size40.0 mm Frequency Response10-20kHz Impedance63 Ohms Sensitivity106 dB/W/m Power Handling1,000mW Plug TypeGold, Stereo Unimatch plug 1/4" and 1/8" Cord Length9.8 ft https://pro.sony/en_HN/products/headphones/mdr-7506#ProductSpecificationsBlock-mdr-7506