With no need to move the hand around to move the cursor, you can minimize movement and maximize performance. The trackball creates 20% less muscle fatigue in your hand, wrist, and forearm than a regular mouse. Plus, the unique adjustable tilt of MX ERGO lets you choose a 0 or 20° angle and instantly improve your wrist and forearm posture. Cruise through your workday with more comfort, ease, and focus on what needs to be done.