The AbleTrack Ergonomic Trackball w/2 hand switches is a precision assistive technology computer trackball for people with arthritis, carpal tunnel, RSI - repetitive stress injury, paralyses of the hands and/or fingers. It is ergonomically designed for those who have difficulty using a typical off the shelf computer trackball or mouse and for those who wear wrist, thumb or hand splints while using their computer. No matter if you have arthritis or are a quadriplegic you can use the AbleTrack.