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. Ergonomic Design Elegant 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 Responsiveness Optical 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 Functionality Previous 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 Pads Flat and smooth pad made of special material. Never lose control and abrasive resistance has been improved greatly. Skin-friendly Surface Use rubber oil coating for preventing sweating fingers slide. Specification: Material: ABS Color: Black,Grey,Blue,Purple,White Engine: Optical Number of Keys: 5 Connection: Wired Resolution: 800-1200-1600 DPI Operating system: for Windows 10, Windows 8, Windows 7, Windows XP, Vista, ME, 2000, Mac OS and other OS Item size: 10.1 * 7.1 * 5.6cm / 3.98 * 2.8 * 2.2in(L * W * H) Item weight: Approx. 99g / 3.49oz Package size: 12.8 * 8.8 * 7.3cm / 5.04 * 3.46 * 2.87in(L * W * H) Package weight: 133g / 4.69oz Package list: 1 * Wired Vertical Ergonomic Optical Mouse Note: The package list without user manual.