Wired Vertical Mouse, Small Ergonomic Mouse High Precision Optical 1.Ergonomic Design:A well-designed and contoured mouse body supports your palm and cradles your thumb and pinky finger. The ergonomic design allows smoother movement and prevents wrist strain caused by traditional mice2.High Responsiveness:Simply press the DPI button and switch between DPI levels 800, 1200 and 1600 to adjust the mouses responsiveness to suit whatever youre doing. Optical Tracking Technology ensures greater sensitivity for precise tracking on a wide range of surfaces3.Wide Compatibility:Compatible with most system including Windows 2000 / ME / XP / Vista / 7 / 8 / 10 / Mac /Linux etc4.Professional Button:Added next/previous buttons provide convenience when webpage browsing; the superior choice for internet surfers, gamers and people who work at length at the computer5.Matte material: the matte is exquisite, comfortable and non-slip, leaving no fingerprints