HEADPHONE SECTION Speaker Φ40mm Sensitivity 108dB S.P.L at 1KHz Impedance 32Ω Frequency Response 20Hz-20,000Hz Rated Power 15mW Power Capability 150mW Cable Lengty Approx.2.3m?.15m Plug Type Φ3.5mm Stereo MICROPHONE SECTION Microphone Unit 9X7mm Dia.Electret condenser Microphone Directivity Omni Direction Sensitivity -58dB?dB Impedance Low Frequency Response 30Hz to 16,000Hz Standard Operating Voltage 3V