Product Specification:Number of Buttons 6Optical Resolution 1000 / 1600 DPILifelong Clicks 1 millionProduct Dimensions 115 x 58 x 87 mm / 4.5 x 2.3 x 3.4inProduct Weight 128g / 4.5ozCompatible System Windows 8 / 7 / Vista / XP / 2000, Mac OS X*Increased ComfortWhile normal horizontal mice place undue strain on the wrist, this model improves the navigating experience by employing basic ergonomic principles. Construction from lightweight plastic allows for easy movement, while the stock’s 45-degree angle encourages a healthy, neutral “handshake” position, which requires little time to get used to.*Unbeatable ValueWith most similarly-designed mice costing anywhere from $50 to $100, the Anker vertical mouse provides a reasonable alternative to both experienced and inexperienced users of such devices. backed by Anker’s top-class customer support team, ensures that you can rest easy in the knowledge of your product’s durability.*Easy to UseThis USB mouse may be inserted directly into either your keyboard or computer and, due to plug & play technology, will be ready to use in no time. 1000 DPI resolution ensures a more responsive feel than most standard optical mice for smooth and precise tracking, while added Next/Previous buttons reduce effort during webpage browsing.