3M offers two Ergonomic Computer Mice, the EM500 and the wireless EM550. Unlike regular mouse, 3M’s offering has a unique vertical grip design that keeps your hand and wrist at a neutral angle. Users can grip the handle and rest their hand on the base and use their thumb to left and right click.
The EM500 and EM550 have optical sensor. They are design for right-hand use only. Each of them are available in two sizes, the Small / Medium EM500GPS and EM550GPS, and the Large EM500GPL and EM550GPL.