Single PWM Fan Speed Controller DC 12V Mute 4 Pin Computer Temperature Control Switch for PC CPU Cooler Fan Single PWM Fan Speed Controller DC 12V Mute 4 Pin Computer Temperature Control Switch for PC CPU Cooler Fan Features: 1: Small size 2: Simple to use 3: The duty cycle is adjustable from 0% to 97%, and the speed regulation range is wide. 4: PWM frequency is 25KHZ 5: Easy to install The single-channel PWM fan control board adopts the PWM speed regulation scheme, which can better adapt to the 4-wire speed regulation fans on the market. By rotating the potentiometer, the fan speed can be easily adjusted. Specifications: The PWM frequency is 25KHZ, which can adapt to most 12V adjustable speed fans on the market The duty cycle can be adjusted from 0% to 97%, and the speed regulation range is wide Rotary potentiometer with switch, easy to start and stop Input voltage: 12V Small size, easy to install Instructions for use: Need to solder the wire by yourself, connect to 12V voltage, pay attention to the wiring sequence from top to bottom, 1 pin is grounded, 2 pin is connected to 12V, and 3 pin is left blank. Rotate the potentiometer, turn on the switch, the red led will light up, which means the power supply is normal. Continue to adjust the potentiometer clockwise, and the fan speed will gradually increase. Note: 1.Due to the light and screen difference, the item's color may be slightly different from the pictures. 2.Please allow 1-3cm differences due to manual measurement. Package includes: 1xPWM Speed Controller _x000D_