Panasonic RPHV297 Stereo Insidephone Headphone with In-Cord Volume Control Lightweight, ergonomic insidephones with twist-free cord and twin XBS ports for increased bass response 10 to 25,000 Hz frequency response 0.55-inch CCAW (copper-clad aluminum wire) drivers with neodymium magnets for rich sound In-cord volume control Includes compact carrying case