Evoluent Verticalmouse 4 Small Wireless Mouse - Optical - Wireless - Radio Frequency - USB - 2600 dpi - Scroll Wheel - 6 Button(s) - Right-handed Only VM4SW

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.