Do you feel painful especially for your neck, shoulders or wrist when you need to use the mice for a long time without a comfortable angle?  Are you worried about the strain and fatigue of your wrist joint? This vertical optical mouse is ergonomically designed to alleviate strain on wrists with cozy comfortable pinky finger & thumb rest and a full contour shape seamless palm supporting, healthy and efficient. Features:Ergonomic DesignElegant contoured shape seamlessly supports your palm, featuring more flexible and smoother movement, alleviating wrist tension and eliminating wrist joint's fatigue. Cozy comfortable and healthy. Rapid ResponsivenessOptical tracking tech. allows higher sensitivity for extra-precise tracking. One button switchable between DPI levels 800, 1200, 1600 to adjust cursor speed to suit various usage scenario. Upgraded FunctionalityPrevious and next page buttons for hi-speed web, files browsing and work flow, perfect for gaming enthusiast, programmer, office staff, teen Internet surfer and people who sit at length at computer. Smooth PadsFlat and smooth pad made of special material. Never lose control and abrasive resistance has been improved greatly.  Skin-friendly SurfaceUse rubber oil coating for preventing sweating fingers slide.  Specification:Material: ABSColor: Black,Grey,Blue,PurpleEngine: OpticalNumber of Keys: 5Connection: WiredResolution: 800-1200-1600 DPIOperating system: for Windows 10, Windows 8, Windows 7, Windows XP, Vista, ME, 2000, Mac OS and other OSItem size: 9.8 * 7.5 * 7cm / 3.86 * 2.95 * 2.76in(L * W * H)Item weight: Approx. 100g / 3.53ozPackage size: 12.7 * 9.8 * 7.4cm / 5 * 3.86 * 2.91in(L * W * H)Package weight: 135g / 4.76oz Package list:1 * Wired Vertical Ergonomic Optical Mouse Note: The package list without user manual.