Speaker diameter: 53 millimeters Impedance: 30Ohms±15% Headphone Sensitivity: 111±3 at 1KHz;1mW Rated power: 10mW Aggregate capability: 20mW Frequency Response: 20Hz-20,000Hz Cable Length: 2.2 meters ±5% Microphone Sensitivity: -38DB±3DB Microphone Impedance: 2.2khms Mic Direction: omnidirectional