earphone,headphone,headset,earplug,computer earplug,pc earphone,pc headset,pc headphone Headset w/mic & volume control Speaker Φ40mm Sensitivity 105dB S.P.L at 1KHz Impedance 32Ω Frequency Response 20Hz-20,000Hz Rated Power 100mWMic. Unit 9X7mm Dia.Electret condenser Mic. Directivity Omni Direction Mic.