The Contour Wireless Unimouse features a patented articulating hinge that allows you to work comfortably by adjusting the angle of body tilt. Its innovative design helps to reduce RSI and with a tri-axis thumb rest, it accommodates any hand size and shape, allowing you to relax your grip in any position. It comes with a 470mAh Lithium-Ion Polymer battery that provides up to 3 months of battery life on a single charge