Key Features;
• Microphone Type: Bi-directional 

Input
• Impedance: 22 Ohms
• Sensitivity (headphone): 122 dB +/-3 dB
• Sensitivity (microphone): -44dBV/Pa +/-2.5 dB
• Frequency response (Headset): 20Hz-20KHz
• Frequency response (Microphone): 100Hz-6.5KHz