Optical Technology Navigate with better speed, accuracy, & 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 h&. Ambidextrous design makes it comfortable either way. Customizable Buttons Get quick access to the media, programs, & files you use most often. Device Stage Quickly & easily access common tasks, including product information, registration, settings, & more for popular devices such as cell phones, cameras, printers, & mouse, keyboard, & webcam products. Ergonomic Design Point & click in comfort. Ergonomic design helps you work longer without discomfort.