The KE/29 is lightweight with an in-the-ear design for deep bass and listening to music on the go. The KE/29 features a dynamic element that is positioned just outside the ear for extended frequency response of 15-20,000Hz. The KE/29 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 KE/29 is available in a variety of colors to compliment today?s portable MP3 players. Built to last, the KE/29 is covered under the Koss? No-Questions-Asked Lifetime Warranty - the only warranty of its kind in the stereophone industry.