The Koss KE29BZ is a portable isolation earbud stereophone. With a dynamic element for extended frequency response of 15-20,000 Hz. This compact design provides a robust sound. The KE29BZ is a lightweight, in-the-ear earbud for music on-the-go. The straight, dual entry 4 foot cord includes an inline volume control. A convenient carrying case provides protective storage and the small, medium and large silicone ear cushions included allow for a customized fit.