Get the perfect fusion of functionality, aesthetics and comfort. The unique asymmetric shape and patterned soft rubber surface keep your hand comfortable hour after hour. You?ll enjoy precise cursor control and effortless scrolling thanks to Logitech Advanced Optical Tracking and a comfortably wide scroll wheel. Energy-efficient engineering gives you 2-year battery life* so you can go longer between battery changes. (* Battery life may vary based on user and computing conditions.) Click, scroll and move your mouse around all day without over-working your hand. The right-handed contoured shape and curved soft rubber grip are designed to support your hand and guide it to a natural, comfortable position. Energy-efficient engineering means you can go longer between battery changes. Smart sleep mode automatically puts the mouse to sleep when you?re not using it. An On/ Off switch helps conserve even more power. (* Battery life may vary based on user and computing conditions.) Plug the Nano receiver into a USB port once and forget about it. It?s so small you can leave it in your computer and enjoy a reliable wireless connection that?s always ready when you are. Do everything faster and easier. With Logitech Advanced Optical Tracking, you get the responsiveness and precision accuracy you need to highlight text, click web links and place the cursor exactly where you want it. More surface area for your finger gives you an improved scrolling experience. Whether you?re scrolling line by line or through pages of search results, the wider wheel makes it effortless to get where you want to go.