Hand-sculpted comfort contourThe perfectly sculpted hand crafted shape of this comfort mouse supports your hand and wrist in a comfortable natural position.Experience fine-motion control and fluid experience with well-positioned buttons and wheels.Speed-adaptive scroll wheelScroll through long documents or web pages faster and easier. The precision wheel auto-shifts from click-to-click to hyper-fast scroll.Unique thumb wheelExperience side-to-side scrolling with a stroke of your thumb. To unlock the full range of thumb wheel possibilities install Logitech Options software.Darkfield Laser TrackingDarkfield Laser Sensor tracks flawlessly virtually anywhere even on glass* and high-gloss surfaces.