Drawing upon the phenomenal success of the original Rheobus, Sunbeam's Rheobus Extreme excels even higher. The Sunbeam Rheobus Extreme takes you to a place of control unprecedented amongst other fan speed controllers. Fits into any standard 5.25" drive bay, the Rheobus Extreme not only allows you to control fans, but your CCFL light kits as well. What makes the Rheobus great is that you have full control from 0 to 12 volts across all 6 channels. Other fan controllers only allow you a range of 7 to 12 volts, but most of the time you will want to set your fans lower than that, and the Rheobus Extreme makes it happen. Another great feature of the Rheobus Extreme is that it can control your CCFL light kits as well, but not only as an on/off switch it allows you to control the brightness of your lights as well! The super bright LED's are a great asset to see where your fan settings are. The knobs with glow dependent on which setting they are at, the higher the fan speed setting, the brighter the knob on that channel will glow, not only is this feature cool looking, it quickly allows you to see which of your fans are running on high voltage and which are running on low voltage.