Sony MDR-V250V. Headphone frequency: 16 - 22000 Hz, Headphone sensitivity: 38 dB, Impedance: 24Ω. Connectivity technology: Wired, Cable length: 2m. Colour of product: Black. Weight: 120g. Dimensions (WxDxH): 175 x 72 x 245 mm, Type: dynamic, Connector(s): Gold plated stereo unimatch plug