Microphone Type: Unidirectional Input Impedance: 32 Ohms Sensitivity (headphone): 100 dB +/-3 dB Sensitivity (microphone): -58dBV/μBar, -38dBV/Pa +/-4 dB Frequency response (Headset): 20 Hz - 20 kHz Frequency response (Microphone): 100Hz-16KHz Analog connection with 3.5mm audio in and audio out jacks ( two pin)