Logitech Wireless Mouse M315 - Vivid Violet 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 (AA Battery included!) - 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.