FlyStone&reg; Ergonomic Optical USB Wired Vertical Mouse / Computer Mouse High Precision Optical Wired Mouse For Laptops PC And Mac Computers / With Scrolling Wheel / Back and Forward Side Buttons (Silver) Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. 800 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 brownsing, best choice for internet surfers, gamers and people who work with computer. USB connection, plug and play; compatible with all versions of Windows OS, Mac OS X, Linux. Product Dimensions: 8.5 x 7 x 3 inches ; 4.6 ounces