Power Supply: 2 x AA Batteries Operating Time: 3-year battery life Operating System Supported: Windows XP, Windows Vista or Windows 7 Mac OS X 10.5 or later Linux kernel 2.6+ System Requirement: USB port Internet access Features: Micro-precise scroll wheel With more grooves per millimeter, our new scroll wheel gives you the ultimate navigation experience. It makes scrolling through long web pages faster and easier Ergonomically shaped The ergonomically shaped design and soft rubber grips conform to your hand to be naturally comfortable, and the compact size makes it easy to take with you wherever you use your computer—at home, at work, or anywhere else. 3-year battery life With the world's longest-lasting battery, you can practically forget about changing batteries. Plus, the smart sleep mode saves power, while an ind...