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 tendinitis can be relieved or often eliminated with regular use. Adjustable Wristband - Adjustable DPI settings allow you to change the sensitivity of the cursor (800/1200/1600/2400) and allow you to slow down tasks, require precision, or increase navigation speed. This mouse no longer requires AA batteries. There are batteries inside. You have just charged a USB cable. Don't worry about buying batteries Wide compensation possibility: IBM or compatible computer. Windows: 2000/ME/XP(x64)/Vista/7/8, Mac OS X (V10.4 above) one available USB port