Professional-grade headset is designed for heavy-duty use in K-12 and college classrooms and labs. Discovery headsets are ideal for reading, science and math applications and are compatible with CD/DVD players, TVs, tape players and most computers. It features built-in noise cancelling dynamic or electret microphone that is designed for use with voice recognition software and is why Discovery headset is so widely used for gaming and language learning programs. Discovery is remarkably comfortable because of its extra deep earcup cavities and is very quiet with ambient noise reducing earcups, which help keep students on task while reducing need to increase volume. Beneath its rugged headband is flexible comfort sling, which contours to user's head for better weight distribution and balance, also contributing to more comfortable experience. Volume control is on the back of the right earcup.