Stereo headphone with microphone Headphone: Speaker: ?0mm Sensitivity: 103dB SPL at 1kHz Frequency response: 20Hz to 20kHz Impedance: 32Ω Rated power: 15mW Power capability: 150mW Cable length: 2.5m?.3m Plug type: ?.5mm stereo Microphone: Microphone unit: 6 x 5mm (Dia.)electric condenser Microphone directivity:Omni-direction Sensitivity: -58dB?dB Impedance: low Frequency response: 30Hz to 16kHz Operating voltage: 3V