Logitech® Advanced Optical Tracking Enjoy precise clicking and pointingon surfaces other optical mice cant handlewhile navigating your favorite websites thanks to Logitech Advanced Optical Tracking Logitech Advanced 2.4 GHz wireless connectivity You get the reliability of a cord with wireless convenience and freedomfast data transmission and virtually no delays or dropouts. 1-year battery life You can go for a year without battery hassles. An On/Off switch and smart sleep mode extend battery life. while an indicator light eliminates surprises Plug-and-forget nano-receiver So small and unobtrusive. you can plug it into a USB port and forget about it. Plus. you can say good-bye to worries about broken or lost receivers. Compact comfort Youll enjoy more comfort and ease thanks to this compact mouses hand-friendly. contoured design with soft rubber grips and a smooth scroll wheel. Logitech reliability You get the high quality and reliability that have made Logitech the glo