Apple always the best (FOR MAKING MONEY)
Just as other customers already said, very simple: After short time the little scroll ball gets erratic and stops scrolling.Why? Obviously because dust gets inside and then makes it malfunction. Unlike all NONApple mouses, here YOU CANNOT remove it and clean it or wash it with soap. Therefore, once it starts working erratically, you can simply throw away you Mighty Cra.. Mouse. Thanks Apple.