Evoluent VerticalMouse

Avoid forearm twitsing for comfort and good health. The patented shape 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.
VerticalMouse is available in four versions, Right, Left, Right Wireless (USB Receiver), and Right Small. The small version is for hand sizes less than 7 inches, measuring from wrist to tip of middle finger.
Comfortable and easy to use

The shape is thoughtfully sculpted for uncompromised comfort and easy-to-reach programmable buttons. No finger contortions are needed to operate the buttons.
Improved thumb rest
The thumb rest has been reshaped to provide even more comfort over earlier versions.