Four-wire PWM fan temperature control governor with control signal 10V, supports common EBM four-wire fan. Supports conventional high-voltage fan four-wire control (10V PWM signal); supports low temperature shutdown fan (PWM off or extended relay to turn off fan power). Wide voltage operation DC11-55V; supports 2.5KHz and 20KHz frequency settings; supports anti-stall fans. Power supply voltage: DC11-55V (circuit operating voltage). Working current: Less than 0.1A. Fan current: Less than 5A (on-board connector withstand capability, if you need to control higher power, you only need to take the power cord separately). PWM range: 5-100 or 0 (% plus or minus 0.3%). PWM frequency: 20KHz or 2.5KHz (2%). PWM signal amplitude: 10.5V (no load). Temperature measurement range: -9.9-99.9 C. Temperature measurement error: error within 0-50 C is less than 1.2 C, other range error is less than 2 C. Interface introduction: Power connector (blue screw terminal): The main power input interface supplies power to the control board and the fan. Fan interface (white VH3.96-4P socket): fan output interface, please refer to the picture for line sequence. Temperature probe interface: Connect NTC probe parameter 10K B=3950. Alarm signal port (WORK): Outputs a high level during normal operation and outputs a low level when the fan is abnormal. Relay interface (RELAY): An expansion interface that drives a 9V or 12V relay that can be used to control the fan power line. When the fan control is stopped, the relay is disconnected. Material: plastic. Color: green. Package Contents: 1 x Controller. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.