Microsoft 3000 3-Button Wireless Notebook Optical Scroll Mouse (Gray) Microsoft Wireless Notebook Optical Mouse 3000 General Features: Two-tone gray gray color Wireless freedom 3-buttons Scroll wheel (acts as a third button) High definition optical technology 1000 dpi resolution 6+ months battery life Includes Snap-in USB receiver Comfortable in either left or right hand Device Stage feature for easy access to common tasks