Koss SB49 Communication Stereophone Delivers high sensitivity &amp; reduced distortion Volume control on cord Ideal for gamers Features anisotropic ferrite magnets Frequency response: 18 Hz-20 KHz Full-sized headset with electret microphone for hands-free communication from your personal computer Ideal for PC voice applications, interactive gaming and speech recognition Closed leatherette ear cushions for maximum isolation and deep bass Volume control for easy level adjustment Collapsible design for protective storage and maximum portability