Logitech Wireless Mouse M275 Comfortable right-hand contoured mouse: Unique curved shape guides your hand to a natural position 18-month battery life: Go longer between battery changes (Battery life may vary based on user and computing conditions) Logitech Advanced Optical Sensor: Smooth cursor control, precise tracking and easy text selection Tiny plug-and-play wireless receiver: Just plug it into a USB port and the mouse automatically connects to your computer Wide scroll wheel: More surface area for effortless line-by-line or page scrolling