HEADPHONE SECTION Speaker Φ40mm Sensitivity 103dB S.P.L at 1KHz Impedance 32Ω Frequency Response 20Hz-20,000Hz Rated Power 100mW Power Capability 1000mW Cable Lengty Approx.2.5m?.3m Plug Type USB2.0 MICROPHONE SECTION Microphone Unit 6X5mm Dia.Electret condenser Microphone Directivity Omni Direction Sensitivity -58dB?dB Impedance Low Frequency Response 30Hz to 16,000Hz Standard Operating Voltage 3V