For those who want the perfect mix of performance, precision and price. With a micro-precise scroll wheel for the ultimate online navigation experience and ergonomic shape., , Micro-precise scroll wheel, With more grooves per millimeter, our new scroll wheel gives you the ultimate navigation experience. It makes scrolling through long web pages faster and easier, , Ergonomically shaped, The ergonomically shaped design and soft rubber grips conform to your hand to be naturally comfortable, and the compact size makes it easy to take with you wherever you use your computer—at home, at work, or anywhere else., , Logitech Unifying receiver, The tiny receiver connects up to 6 Unifying-compatible devices. Add a keyboard, switch between mice, mix and match to fit your lifestyle. All without having to change nano receivers or sacrifice another USB port., , Logitech Advanced Optical Technology, Laser-grade precision tracks over the most challenging surfaces—including smooth, glossy surfaces—that are problematic for standard optical mice. All while using less power so you get longer battery life and more convenience.