The Logitech Wireless Mouse M305 is ergonomically designed a natural shape and non-slip, rubber side panels provide extra comfort and control—even after long hours of use—while the ridged wheel provides a better grip for scrolling. Plug-and-forget nano-receiver So small and unobtrusive, you can plug it into a USB port and forget about it. If you do need to remove it, the receiver stores inside the mouse. This 1,000 DPI black and silver laser mouse uses one AA battery.