Optical Technology Navigate with better speed, accuracy, and reliability. The optical sensor tracks movement on nearly any surface. Scroll Even Faster Move through your documents quickly without having to use the on-screen scroll bar. Comfortable in Either Hand Use your mouse with your left or right hand. Ambidextrous design makes it comfortable either way. Customizable Buttons Get quick access to the media, programs, and files you use most often. Device Stage Quickly and easily access common tasks, including product information, registration, settings, and more for popular devices such as cell phones, cameras, printers, and mouse, keyboard, and webcam products. Ergonomic Design Point and click in comfort. Ergonomic design helps you work longer without discomfort.