Product details:

The patented shape of the mouse supports your hand in an upright neutral posture that generally avoids forearm twisting. Many users, including medical doctors, ergonomists and physical therapists, said the Evoluent VerticalMouse provides superior comfort and even relieved their wrist pain.Comfortable and easy to use
Adjustable laser sensor
Improved thumb rest
Pointer speed indicators
Now two thumb buttons
Lighted Evoluent logo
Extended lip prevents rubbing
Powerful and intuitive driver