The Sennheiser PMX70 are neckband stereo headphones released by Sennheiser as a part of their Sport line. The first thing you will notice about them is their neon green color, including cord and plug, but they have more to them than just a fancy color scheme. They have a patented ultra-lightweight and flexible construction with an ergonimic neckband and design that keeps the transducer at 90 degrees to the ear for optimum comfort, stability and sound quality. The powerful neodymium magnets in the earphone speakers give these headphones incredible detailed sound reproduction. They are also sweat and water resistant making them a perfect choice for jogging or other physical activity, and also allowing you to wash them to extend their life. They are great to use with MP3, CD, DVD, and MD players, as well as with all portable game systems and the included cable clip keeps loose wires in check.