???Ergonomic Mouse:This vertical mouse is design for users to reduces muscle strain and can even undo the damage that years of using a traditional computer mouse causes. Wrist pain, shoulder fatigue, Carpal Tunnel Syndrome and tendonitis can all be alleviated or, in many cases, eliminated with regular use. ???Vertical Mouse Adjustable DPI: The adjustable DPI settings allow you to change the sensitivity of the mouse???s pointer speed (1000 / 1600 / 2400), allowing you to decrease speed for tasks that require guaranteed precision or increase the speed faster for browsing. ???Wireless Rechargeable Mouse: This wireless ergonomic mouse doesn???t need to use AA battery now .it have battery inside the mouse! you just used USB cable charging!!Did not need to worried to buy batteries again again! ???Pink Mouse Wide Compatibility:IBM or compatible computer. Mac OS X???over V10.4???An available USB port ???Customer Satisfaction: 30-day Free Return and Refund,12-month warranty for Attoe vertical wireless mouse,24-hour Response Time for Customer Issues