Features:</strong><br /> <strong>Ergonomic Design</strong><br /> 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.<br /> <br /> <strong>Rapid Responsiveness</strong><br /> Higher sensitivity for extra-precise tracking, it works in a superior fast way. One button switchable between DPI levels 800, 1200, 2000, 3200 to adjust cursor speed to suit various usage scenario.<br /> <br /> <strong>Upgraded Functionality</strong><br /> 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.<br /> <br /> <strong>High Compatibility &amp; Quick Access</strong>&nbsp; &nbsp;<br /> This vertical mouse works greatly for Mac OS X, for Linux, for all versions of Windows OS and more. Plug-and play, simply plug it into a PC USB port, it works in a in ultra high efficient way.<br /> <br /> <strong>Automatic Sleeping Mode</strong><br /> It'll automatically enter sleeping mode after long time inactivity or power failure. Click any button to wake it up at any time. Energy-efficiency and security.<br /> <br /> <strong>