Microsoft Wireless Optical Mouse 4000
With High Definition Optical performance, this compact notebook mouse makes computing on the go much easier. Wireless Notebook Optical Mouse 4000 features a snap-in USB receiver for easy storing and a new compact Tilt Wheel and Magnifier for advanced navigating, viewing and editing. Whether in the office or the outdoors, you can expect greater precision, smoother tracking and improved responsiveness—not to mention more than six months of battery life on just one AA battery.

This mouse delivers more comfort and control than touch pads and toggle sticks that come with your notebook computer. A recent study showed that notebook mouse users experience a lower incidence of pain in comparison to users who don't use an external pointing device.