This innovative mouse combines advanced cordless and optical technologies. You can use it on any surface, and there's no cord to wrestle with or ball to clean. The Logitech Cordless MouseMan Optical works in a six-foot range without being pointed at the computer. Thanks to Logitech's advanced digital radio technology, it performs even on desks crowded with cups, books, and piles of paper. The wheel provides easy scrolling and quick access to your favorite Web sites. Logitech's smart power management allows the mouse to work beyond two months on the included AA batteries. The low-battery indicator gives plenty of warning before batteries die.