Logitech Performance Mouse MX Troubleshooting Manual page 22

The Performance Mouse MX is not supported on Windows 98, Windows ME, Windows 2000,
UNIX or Linux.
I do not see a laser light on my Performance Mouse MX
Your Performance Mouse MX uses an infrared (IR) laser, invisible to the human eye.
If you are not sure whether your mouse is turned on or off, check the power ON/OFF switch
located on the bottom of the mouse.

If the power switch is set to ON, your mouse is ON.

If the power switch is set to OFF, your mouse is OFF.
Power ON
Performance Mouse MX operating distance
In ideal situations, the Performance Mouse MX can operate up to 30 feet (10 meters) with the
receiver in clear sight of the mouse.
Power OFF