Ergonomic Design: This mouse is designed for users to reduce muscle strain and even eliminate the damage caused by years of using a traditional computer mouse. Wrist pain, shoulder fatigue, carpal tunnel syndrome and tendonitis can be relieved or often eliminated with regular use.Adjustable Wristband - Adjustable DPI settings allow you to change cursor sensitivity (800/1200/1600/2400) and allow you to slow down tasks, require precision or increase browsing speed.This mouse no longer requires AA batteries. There are batteries inside. You have just charged a USB cable. Dont worry about buying batteriesWide possibility of compensation: IBM or compatible computer. Windows: 2000/ME/XP(x64)/Vista/7/8, Mac OS X (V10.4 above) one available USB port