Koss KEB20 DVD is lightweight with an in-the-ear design for deep bass and listening to music on the go. The KEB20DVD features a dynamic element that is positioned just outside the ear for extended frequency response of 15-20,000Hz.The KEB20DVD includes small, medium and large silicone ear cushions for a customized fit to enhance isolation when you want to eliminate ambient sounds that interfere with the listening experience. The KEB20DVD also includes a lightweight volume control on the cord for easy level adjustment