This Kaze Master 5.25" is a practical fan controller boasting extra functions like temperature monitoring with an alarm feature and the choice of Celsius or Fahrenheit. The unit has an LCD readout for clear legibility and analog knobs for precise adjustments. Up to four fans can be monitored and controlled. As a safety feature, the monitor emits an alarm when temperature goes above 75 degrees C (or 165 degrees F) or in case of temperature sensor failure. Turning the knob counterclockwise the whole way turns off the fan. As you turn clockwise, you can adjust the fan's voltage from 3.7V to 12V. Clean, digital, and sharp, this fan controller looks great with any system.