MX Ergo Plus is a new standard of comfort and precision. Logitech's most advanced trackball for trackball enthusiasts and power users searching for alternatives to mice and touchpads. Delivers 20% less muscular strain compared to a regular mouse. Features a unique adjustable hinge plus extra 10 degree wedge for customized comfort and the latest tracking, scrolling and power management technology. Logitech FLOW enables effortless multi-computer control.