Designed to allow the muscles in the user’s hand, arm, and shoulder to relax while in use, the Zero Tension Mouse is made to reduce the likelihood of developing repetitive strain injury. The mouse was created by Dr. Michael Leahy, who has worked extensively with repetitive motion disorders and has developed a “law of repetitive motion,” defining four factors involved in related injuries. The single factor that can be minimized is tissue tension and relaxation of the muscles in use, and the Zero Tension Mouse was then devised as a method of relaxing muscles engaged in mouse use and reducing the threat of injury. With two side buttons, where your fingers naturally rest, and a scroll wheel on top, the mouse fits and functions comfortably and ergonomically in the hand. More