Scientific ergonomic symmetrical design encourages healthy neutral.6-Foot anti-tangle TPE cable is more convenient 1000 / 1600 / 2000 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces Added next/previous buttons provide convenience when webpage browsing the best choice for internet surfers, gamers and people who work at length at the computer Soft rubber grip and contoured body deliver continuous, all-day comfort. Up to 8 million clicks over a lifetime Plug & Play, Compatible with Windows 7, 8, Windows XP, Vista, ME, 2000 and Mac OS, or the latest system