Plug-and-play wireless—thanks to Logitech® Advanced 2.4 GHz wireless technology—gives you the reliability of a cord with wireless convenience and freedom—fast data transmission and virtually no delays or dropouts. You can go a full year without battery hassles. The On/Off switch and smart sleep mode help conserve power.* * Battery life may vary based on user and computing conditions. You get the high quality and reliability that have made Logitech the global leader for mice—plus a three-year limited hardware warranty. No software, no hassles. The tiny nano receiver works right away and is small enough to leave in your USB port so you won’t lose it. Your touchpad just can’t compete with the hand-friendly shape of this comfy, contoured mouse.