The R-Go HE Basic vertical mouse has an ergonomic design that ensures your arm and hand maintain a natural, relaxed posture. This natural ‘thumb-up’ posture encourages larger mouse movements, which are healthier than small movements from the wrist. This takes the strain off the small muscles and tendons in your wrist and hand, helping to prevent troublesome conditions such as RSI. Make sure you don’t set the mouse’s cursor speed too high, otherwise you’ll probably still end up making small, tense movements. This mouse has been deliberately designed to be lightweight, so you need less muscle strength to move it.