The Clef is a unique portable earbud with retractable cord that includes a key chain and LED flashlight.Never be without your headphones again. Along with your home and car keys you can now carry the Sound of Koss. The Clef is ideal accessory for portable users.The Clef earbud is ultra-lightweight and features an electro/dynamic element for an extended frequency response of 40-20,000 Hz. The retractable cord mechanism allows the user to adjust the cord to a customized length. The unique carrying case also features a key chain for maximum portability for on-the-go listening. With the touch of a button, the LED flashlight provides a stream of light in dark environments.