Spritech TM USB Wired Health Vertical Mouse Human Ergonomic Wireless Mouse 5 Button Vertical Ergonomic Mouse Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. Perfect for all computer worker,such as: office white-collar,software engineer, internet surfers, gamers and people who work at length at the computer. Five Button,Full Function Mouse. 1200 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