The product boasts an exquisite appearance and simple, practical wiring. Stable Performance Product Parameters: Working Voltage: DC12V (operates within 8-15V, pay attention to fan voltage). Fan Current: Max 3A, current limited by switches and connectors, can be extended with power cables. Board Loss: Less than 20mA without fan. PWM Signal Mode: 5V 25KHZ PWM Signal Output Range: 0%-100%. PWM Start Position Adjustment Range: 0%-60%. Output Interface Model: 2510-4P offset, conventional CPU, chassis fan socket, 2.54mm pin pitch. Function Description: Pay attention to polarity and power supply voltage. Connect the fan to the power supply to use. Turn the potentiometer counter-clockwise to the end for minimum output, and clockwise to the end for maximum output. A separate small adjustable resistor (start speed adjustment) on the board is used to adjust the fan's speed at the initial startup position. If the fan speed changes in the opposite direction of the adjustment, it indicates an inverse sequence fan. In this case, the adjustment point (PF) needs to be short-circuited by soldering, and the power supply must be disconnected before operation to avoid damage! Short-circuiting the PWM signal will reverse the adjustment direction, allowing the inverse sequence fan to be adjusted correctly. Precautions: This is a four-wire PWM fan speed controller. It can only control 12V four-wire fans that support PWM speed regulation. Many 12V four-wire chassis or CPU fans cannot control 2- or 3-wire fans. Color: As shown Material: Plastic + Metal Package Contents: 1 Module Only the above package contents are included; other products are not. Note: Light reflections and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.