General description This PWM Speed Controller is designed for 12V 4-wire PWM fans and pumps, featuring a built-in DC-DC booster circuit. It allows for precise speed control of standard 12V fans and computer water cooling PWM pump heads, making it an ideal choice for DIY water cooling setups. Technical specifications Input voltage: 5V Output voltage: 12V PWM frequency: approximately 25KHz Output current: rated 0.5A / maximum 0.7A Input port: USB Type-C female port Output: PWM 4-pin Speed range: PWM duty cycle 0-100% Type: A-1 to 3 Adapter cable Material: PLA Color: Black Usage The fan speed can be adjusted from 0-100% by turning the knob: clockwise to increase speed and counterclockwise to decrease speed. To turn off the output, simply turn the knob counterclockwise. It is recommended to keep the output current below 0.7A for short-term use and below 0.5A for long-term use, as the fan current varies proportionally with speed. Other information Package Contents: 1 x PWM Governor, 1 x