PRODUCT NAME： STEREO HEADPHONE WITH MIC ITEM NO： TNDHP-540MV DESCRIPTION　 Headphone Section *Speaker:Φ40mm *Sensitivity:108dB S.P.L at 1KHz *Impedance:32Ω *Frequency Response:20Hz-20KHz *Rated Power:15mW *Power Capability:150mW *Plug Type:Φ3.5mm? Stereo Microphone Section *Microphone Unit: 6?mm Dia. Electret Condenser *Microphone Directivity: Omni Direction *Sensitivity: -58dB?dB *Impedance: Low *Frequency Response: 30Hz to 16KHz *Standard Operating Voltage: 3V