Recently Logitech announces Two New Mice Featuring Darkfield Laser Tracking Technology, They are the Logitech Performance Mouse MX and the Logitech Anywhere Mouse MX. This new Darkfield Technology allows users to use the mouse virtually anywhere they want on any reflective surface with minimum 4mm thick. Both Performance Mouse MX and  Anywhere Mouse MX are expected to be available in the U.S. and Europe beginning in August.