Using high-quality materials, the quality is guaranteed With switch, can be turned off.The appearance of the product is exquisite Simple and convenient wiring.Stable performance Product parameters:Working voltage: DC12V (can work under 8-15V voltage, please pay attention to the same fan voltage). Fan current: no more than 3A, this current is limited by switches and connectors, and can be expanded by power lines alone. Loss of circuit board itself: less than 20mA without fan. PWM signal mode: 5V25KHZ PWM signal output range: 0%-100%. position PWM adjustment range: 0%-60%. Output interface model: 2510-4P dislocation, conventional CPU, chassis fan socket, pin spacing 2.54mm Function Description: Pay attention to the and negative poles and the power supply voltage. After the power supply fan is connected, it can be used. The potentiometer is turned off counterclockwise to , and the clockwise end is the maximum output. A separate small adjustable resistor (starting speed adjustment) on the board is used to adjust the speed of the just-open position If the speed change of the fan is opposite to the adjustment direction, it means that the fan is a reverse-sequence fan, and the (PF) setting needs to be short-circuited with solder, and the power must be cut off operation to avoid damage! The short-circuited PWM signal changes in the reverse direction with the adjustment, and the reverse-sequence fan can realize forward adjustment. Precautions: This is a four-wire PWM fan speed controller. It can only control 12V four-wire fans that support PWM speed regulation. For example, many 12V four-wire chassis or CPU fans cannot control 2-3-wire fans. Colour:As Shown Material:plastic+metal Package Contents: 1 x Module Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.