The Kaze Master 5.25" is able to control and monitor up to 4 fans, as well as monitor the temperature of up to 4 locations in your system. These figures are displayed on the VF-Display. Fans can be completely stopped if desired, and the unit also features an alarm for fan malfunction or overheating. Fan Controller and Temperature Monitor Features: Kaze Master is able to control and monitor up to 4 fans, and 4 temperature monitor independently. These figures are displayed on the VF-Display. Passive Safety - Safe Alarm Feature: To safely monitor and run your system, Kaze Master comes with an alarm feature to inform you in case of a fan malfunction. The alarm will also notify you if the temperature goes above 75°C (165F), or in case of a temperature sensor failure, the VF-Display will blink the number "0" or "0.0" and trigger the alarm sound. If the alarm sound disturbs you, you can even shut down the alarm sound by a simple jumper setting. 2-Way Temperature Display: Both Celsius and Fahrenheit unit can be displayed by a simple jumper setting. Fan Stop Function: By turning the knob counter-clockwise all the way, the fan can be stopped. Wide Variable Voltage to Control Fans: You can control fans between 3.7V – 12V to meet your needs for system requirement. By setting the voltage to the lowest level you can silence your PC or turn it up to the highest to get the maximum cooling performance.