HEADPHONE SECTION : Speaker : 27mm Sensitivity : 108dB S.P.L at 1KHz Impedance : 32ohm Frequency Response : 20Hz-20,000Hz Rated Power : 15mW Power Capability : 150mW Cable Lengty : Approx.1.8m?.3m Plug Type : 3.5mm 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 Packing list : DESCRIPTION : classic&economic lightweight stereo headset widely used UNIT PACKAGE : blister card PCS /CTN : 80 CTN SIZE(CM) : 54*48.5*37 G.W.(KGS) : 9