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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 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. 4.8 ft USB cable length, product dimensions: 101 x 82 x 80 mm; product weight: 4.5 oz. Package includes: 1 Anker Vertical Ergonomic Optical Mouse (with 4.8 ft cable), 1 instruction manual. Includes 18 month warranty and lifetime technical support guarantee.