Ergonomic mice fit perfectly in your hand and keep your elbow in the right position. In fact, using one may actually promote a better posture.
When using a vertical mouse, such as the MX Vertical, your wrists and arms are in a more natural, comfortable position. The Logitech Lift Vertical Ergonomic Mouse is designed for people with tiny to medium hands, as well as those who are left-handed.
Using these mice helps keep your forearm in the perfect position for extended use. As it also takes the pressure off your wrist, tendons, and nerves, so you can protect yourself from developing any musculoskeletal problems down the road.