Anker Ergonomic Optical USB Wired Vertical Mouse 1000/1600 DPI, 5 Buttons CE100 Scientific ergonomic design encourages healthy neutral "handshake" wrist and arm positions for smoother movement and less overall strain. 1000/1600 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 superior choice for internet surfers, gamers and people who work at length at the computer. 1.5m/4.9ft USB cable length, product dimensions: 120*62.8*74.8 mm; product weight: 5.3 oz. Package includes: 1 Anker Vertical Ergonomic Optical Mouse (with 4.9 ft cable), 1 instruction manual. Includes 18 month warranty and lifetime technical support guarantee.