Designed for how you use the Web, our newest micro-precise scrolling makes reading or scrolling easier. Plus, tilting the wheel moves you backward or forward on the Web. Based on the best-selling shape in the world, it keeps your hand happy even after long hours of use thanks to its contoured shape and textured rubber grips. With up to 18 months of battery life, it virtually eliminates the hassle of changing batteries. Smart sleep mode saves power, while an indicator light eliminates surprises.* * Battery life may vary based on user and computing conditions. The tiny Logitech® Unifying Nano-receiver stays in your laptop so it's less likely to be lost and gives you a reliable connection with virtually no delays or dropouts. Plus, you can easily add compatible wireless devices to the same receiver. At home, at school, at work- forget about tricky finger maneuvers with your laptop touchpad. Enjoy precise clicking and pointing while navigating your favorite websites thanks to Logitech® Advanced Optical Tracking.