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With or without a mouse pad, the mouse moves easily for precise optical tracking, use the scroll wheel for fast, precise tracking to navigate through your work effortlessly Just plug the cord into your computer's USB port and you're ready to go Adjust your DPI setting (1,000 and 1,600 DPI), high-definition optical sensor delivers smooth, responsive cursor control, so you can work with precision and confidence on a wide variety of surfaces 3-buttons, scroll wheel (acts as third button);