The R-Go HE Basic vertical mouse has an ergonomic shape that lets your arm and hand rest in a natural, relaxed position. This natural “thumbs-up” posture encourages larger mouse movements, which are healthier than small movements from the wrist. This relieves the small muscles and tendons in the wrist and hand, helping to prevent uncomfortable strain injuries such as RSI. Be sure not to set the mouse’s cursor speed too sensitive, or you’ll likely still end up making small, cramped movements. This mouse is deliberately designed to be lightweight, so you need less muscle effort to move it.