USB Mini Adjustable fan governor module refers to the governor can be used when inserted into the 5V USB port (USB port of the mobile phone charger charger, USB port of the computer can be applicable). It is suitable for the 5V USB fan on the market, and can be installed on the laptop radiator fan. USB fan air volume adjustment, stepless speed regulation, weak wind and strong wind arbitrary adjustment. Product parameters: Input voltage :DC4V-12V Output voltage :DC2.5V-7.5V Rated power :5W(Please do not overload) Speed Control Principle: Non-adjustable USB fans are powered by a 5V direct current motor, while two-speed fans have an internal boost circuit board. When in second speed, the boost board boosts the 5V USB voltage before connecting it to the motor, increasing the airflow. This stepless speed regulator has an output voltage range of 2.5V to 7.5V, allowing for arbitrary airflow settings over a wide range. Turning the knob clockwise increases the airflow speed, while turning it counterclockwise decreases it. The knob also has an on/off function. Note: When using the fan in second gear, always set the fan to first gear; otherwise, speed regulation may not be possible. Color: Blue Material: PCB+Plastic+Metal Package Contents: 1* USB Fan Governor (Knob color is random)