Koss Full-Size USB Communication Headset with Noise Reduction Microphone: * Communication headset * Noise-reduction Clear Voice technology (CVT) * Premium sound at all volume levels * Anisotropic ferrite magnet structures deliver high sensitivity and reduced sound distortion * Experience absolute comfort with soft, leatherette ear cushions * Collapsible for compact storage * Frequency response: 18Hz-20,000Hz * Impedance: 100 ohms * Sensitivity: 103dB SPL * Straight, single entry, 8" cord