Dynex DX-840 USB Headset with Microphone Mono headset with a deluxe leatherette ear pad is ideal for long-term use Noise-canceling microphone ensures your voice is heard clearly Adjustable headband for a comfortable fit: 7' cord USB connector for easy connection to a PC:# Impedance: Headset: 32 ohms; Microphone: 2200 ohms # Frequency Response: Headset: 20Hz - 20kHz; Microphone: 100Hz - 16kHz