Logitech Wireless Optical Mouse M315 (Purple Paisley) 910-003131 Logitech Advanced Optical Tracking - Enjoy precise clicking and pointing-on surfaces other optical mice can't handle-while 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 freedom-fast data transmission and virtually no delays or dropouts. 1-year battery life - You can go for nearly 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 - You'll enjoy more comfort and ease thanks to this compact mouse's hand-friendly, contoured design with soft rubber grips and a smooth scroll wheel.