It feels good in either hand even after long hours of use thanks to its hand-friendly, contoured design with soft rubber side grips. The plug-and-forget nano-receiver is so small it stays in your USB port so you wont lose it. If you do need to remove it: the receiver stores inside the mouse. You get a reliable connection with virtually no delays or dropouts thanks to Logitech Advanced 2.4 GHz wireless connectivity. You can stay productive for 12 months without battery hassles. The On/Off switch helps conserve power, smart sleep mode extends battery life, and an indicator light eliminates surprises. Battery life may vary based on user and computing conditions. Youll enjoy smooth, responsive cursor control on a variety of surfaces, easy text selection, and effortless scrolling that you just cant get with a laptop touchpad. You get the high quality and reliability thats made Logitech the global leader for mice at a price you can afford, plus a three-year hardware warranty.