Driver Unit:Knowles Six Balanced Armature and One Dynamic-Hybrid 7Unit High-end Headphones Specifications: Impedance: 13ohms /1KHz Sensitivity: 110dB/mW Frequency response: 20Hz-22kHz Plug Type: L Bending Mornitor Plugs: 3.5mm Connector Pin Type: Copper MMCX Connections Cord Length: 50" /125cm Cable Detachable Cable Type: 8 Strands 19core 6N single crystal copper cable