Specifications: Sensitivity: -58 dBV/µBar, -38 dBV/Pa +/-4dB Frequency Response: Headset: 20-20,000 Hz Microphone: 100-16,000 Hz Off-axis Noise Canceling: -30dB @ 250Hz Signal output (headphones) 680 Ohms Microphone Bias Voltage: 3.0 V DC