The Logitech Mx Ergo Mouse Advanced Wireless Trackball is a scientifically designed ergonomic trackball mouse that decreases hand and wrist movement. Its innovative adjustable tilt allows users to rapidly improve wrist and forearm posture by selecting between 0° and 20° angles. Furthermore, because the trackball eliminates the need to move the hand to move the pointer, it causes 20% less muscular fatigue in the hand, wrist, and forearm than a standard mouse. The MX Ergo's contoured form, adjustable tracking speed, and precise scroll wheel allow for complete customization and hours of pleasant productivity.