Koss USB Headset Noise-Cancelling Mic

This USB Headset Noise-Cancelling Mic CS100-USB is designed by Koss and it can be used with an external power source if sound card does not have built-in bias supply. It has a 30-16,000 Hz frequency response and is designed with oxygen-free copper voice coils. The Noise cancelling microphone provides clear communication and the comfortable foam ear cushions make them comfortable for extended and repeated use. It's cord is a straight, single-entry that is 8 foot long. Ideal for Classrooms, Libraries and School Computer Labs Covered by the Koss Limited Lifetime Warranty.   Features: Single, USB plug for quick headset connection Headset with electret, noise reduction microphone for hands-free communication from your PC Ideal for PC voice applications, interactive gaming and speech recognition Dynamic element for extended frequency response Foam ear cushions for open, hear-through sound Adjustable headband for a great fit   Specifications: Frequency Response: 30-16,000 Hz (headset); 100-16,000 Hz (microphone) Impedance: 32 Ohms (headset); Same as load resistance (microphone) Sensitivity: 91 dB SPL (headset); -56dB +/- 3dB per 1V/µbar@1KHz (microphone); (-36dB +/- 3dB, V/Pa) Cord: Straight, Single-entry, 8ft