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G15 SpeedFan works with any Logitech G15 keyboard and displays realtime temperature, fan speed and voltage information from SpeedFan. It is a breeze to configure, and only requires that you have the Logitech GamePanel Manager software running. The download (below) comes with a default configuration file that will work with most computers, and instructions on how to change it if required. You can set high and low values and if the temperature, fan speed or voltage goes outside that range the value will be displayed in bold on your LCD screen. Very helpful for long gaming sessions if you don't want your computer to overheat.