This ergonomic mouse features a sleek design that allows for a comfortable grip and reduces the strain on your wrist and forearm. It's perfect for people who spend hours at a desk, reducing the risk of repetitive stress injuries. The Evoluent wireless mouse is the world's first mouse with grooved buttons. The shallow groove on buttons where your fingertips rest makes the mouse more secure in your hands and much easier to control. The Smart Scrolling feature of this "VMDL" vertical mouse varies per notch in response to how you roll the wheel, ranging from slow and precise to hyper-speed for scrolling through lengthy pages.