The ergonomically-designed thumb rest and grips fit the contour of your palm for maximum comfort. The vertical "handshake" position encourages a neutral wrist and arm alignment for greater comfort. Five buttons give you improved control over your computer's systems combined with three levels of mouse sensitivity (800 / 1200 / 1600DPI) for improved tracking. There is also an auto-sleep feature that conserves power and extends product life. OS SUPPORTED: All Windows OS Mac OS X
