Proprietary connection to the Korg Student Interface Full range of sound brings music to life</br>Soft leatherette ear cushions envelop ears for long-lasting comfort and maximum isolation without excess pressure Adjustable headband fits most head sizes</br>Even more coverage under the Korg/Koss Limited Lifetime Warranty</br></br>Product Description</br></br>The Korg Group Learning System comes complete with proprietary headphones that allow for two-way communication for maximum teacher/student interaction. These quality headsets are perfect for a classroom and come with a limited lifetime warranty.</br><br/>http://www.amazon.com/gp/product/B00LY0GEN2