Anywhere Mouse MX features Dark field Laser Tracking for cursor control on virtually any surface with a minimum 4mm thickness. The tiny Logitech Unifying receiver stays in your notebook so it does not have to unplugged and risk being broken or lost. Sculpted design comfortably fits your fingers. Hyper-fast scrolling lets you fly through long documents and Web pages. Quickly go back or forward in Web pages with a click of a thumb button. Design also features a nearly frictionless scroll wheel and requires a USB port.