Wireless Mouse M320 is the perfect synthesis of functionality, aesthetics and comfort: A unique asymmetric shape that fits well, a wide wheel that improves scrolling experience and a soft rubber surface with distinctive patterns that improves touch feeling. Everything from curves to colors was designed to delight your hand and eyes. Our energy-efficient engineering gives you 2-year battery life and allows you to focus on what is truly important. Plus, the mouse automatically puts itself to sleep when you are not using it. Finally, its wireless connectivity gives the reliability of a cord and the convenience of wireless freedom.