The ergonomically-designed thumb rests and grips closely supports your palm, the proper vertical design that keeps your hand and arm staying more naturally,healthy neutral "handshake" positions for smoother movement and less overall strain,bring maximum comfort.Effectively reduces the wrist strain and pain, compared with a regular mouse.An ergonomic vertical mouse is a highly essential office item if you primarily work with computers or you are a professional gamer 800 / 1200 / 1600 DPI Resolution(reprogrammable) Optical Tracking Technology provides more sensitivity than standard optical mice,smooth and precise tracking on a wide range of surfaces. Added next/previous buttons provide convenience when webpage browsing.The superior choice for internet surfers, gamers and people who work