Logitech Performance Mouse MX and Anywhere Mouse MX

With Logitech Darkfield Laser Tracking, you can use your mouse virtually anywhere you want – including clear glass (that’s at least 4 mm thick) and high-gloss surfaces. This new technology is available in the Logitech Performance Mouse MX and the Logitech Anywhere Mouse MX, giving you the option of a full-size mouse or a more compact, notebook mouse. 
To track on glass (that’s at least 4 mm thick), Logitech Darkfield uses dark field microscopy to detect microscopic particles and micro-scratches on these surfaces, rather than tracking the surface itself. Similar to the way in which our eye sees the clear night sky, the mouse’s sensor sees the clean areas of glass as a dark background with bright dots – the dust. Then, the sensor interprets the movement of these dots to track exactly where you’ve moved the mouse..In addition to providing unsurpassed cursor control, both of the new Logitech Performance Mouse MX and Logitech Anywhere Mouse MX feature Logitech Unifying receiver.