Evoluent VerticalMouse 4 Right Wireless - Optical - Wireless - Radio Frequency - 2.40 GHz - Black - USB - Scroll Wheel - 6 Button(s) - Right-handed Only VM4RW

The Truly Ergonomic Mouse since 2002 Avoids forearm twisting 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.