updated 07:35 am EDT, Wed August 19, 2009
Logitech Darkfield Mice
Logitech on Wednesday answered Microsoft's BlueTrack with two mice using its own technology to work on any available surface. The Performance Mouse MX and Anywhere Mouse MX both use a laser variant nicknamed Darkfield that uses microscopy to follow dust or very fine imperfections in the surface and can track on glass, granite or other areas where a broader look wouldn't generate enough data. Both also use the new Unifying receiver to support multiple RF-based Logitech devices through one USB adapter.
Either of the two has the free-spinning metal scroll wheel from the company's higher end mice but otherwise vary sharply. The Performance Mouse MX is intended for the desktop and has four programmable side buttons as well as a micro USB cable to charge the mouse without having to stop using it. It also has a unique approach to side scrolling that renders the wheel tilt force-sensitive to scroll faster than it would with just the physical action. The Anywhere Mouse MX has a reduced control set but is considerably smaller and intended for notebook use; it shares the same wheel as the larger mouse.
Both mice ship later this month. The Performance is the more expensive with a $100 price point, while the Anywhere's features drop its cost to $80.
Performance Mouse MX
Anywhere Mouse MX