It's been almost a decade since Logitech introduced the now revered and oft-imitated MX518 optical gaming mouse, and this mainstay peripheral is finally getting a well-deserved upgrade as the new G400. Externally, the design isn't much different; it's merely sporting a stealthier grey hue and a cable that's "thinner and twenty-five percent lighter." All of the tweaks Logitech has made to help improve your fragging life are internal. The optical sensor is twice as sensitive with a maximum 3,600 DPI resolution (selectable down to 400) that maintains
