If you don't use four fans, when you power the rig up, you will get an alarm until you disable the display(s) that no fan is plugged into. That is accomplished by pushing the mode button until that display is flashing, then press the jog wheel once. The spinning fan for that display should become dark, and the alarm will stop.

Changing fan speed is as simple, push the mode button to the fan you want to change speed of, and turn the jog wheel to the RPM setting you want, and press the mode button to set the speed and move to the next fan. I set my fans at 700rpm for the front fan, 1020rpm for the fan blowing on my chipset cooler and 800rpm for the rear fan. All three fans are silent at those speeds.

Holding the mode button for three seconds will set all fans to the default 1500rpm. The alarm will need to be reset if you have one.

The top display shows your rig's power consumption. That is a very cool feature, as I had no idea whatsoever how much juice my rig uses. In the past, I had heard the comment that a computer uses about the same power as a 60 watt light bulb, but I assume that is your basic “off-the-shelf” single-core processor rig. My present rig uses 132 watts at idle, and around 180 watts at load. That is a lot more than I expected, since I run it 24/7, it obviously contributes more to my electricity bill than I thought.

The final function is the readings from the temp sensors. Since I didn't use any, all readings say “no”.