User`s manual

The LCD display
When you switch your computer on, Mode 1 (Extra-quiet) is activated by
default. The AC4G-D LCD display shows the temperature of the CPU and
the current fan level.
Note: Fan level (or speed) is not the same as mode. Each of the four modes
controls fan speed in a different way, but each uses all four fan levels. If you
notice that fan level is continuously high, you may decide to switch to a cooler
mode.
Switching between modes
1. To change modes, press the mode switch for half a second or more.
The LCD display changes to display the current mode.
2. To change modes, press the mode again, repeatedly, to toggle
through the four modes. When you reach the required mode, let the
button go.
After a few moments the LCD display changes back to its regular
temperature/level display.