Logitech MX 1100 Cordless Laser Mouse Elegantly contoured shape that fits your hand naturally for maximum comfort Revolutionary hyper-fast scrolling for flying through documents and Web pages Adjustable dpi laser engine (up to 1600 dpi) for customizable precision Enhanced 2.4 GHz cordless technology for more robust, reliable performance 10 programmable buttons, including a "stealth" thumb button, for additional control