1. This controller can only control the 12V standard 4-wire PWM fan, and control the fan speed through the PWM signal. The actual speed change of the fan is affected by the design of the fan itself. Can't adjust the speed of 2-3 wire ordinary fan.2. This controller participates in control, and the circuit cannot be connected to the reverse polarity If the connection is reversed, the circuit board safety bit "F" position may be burntParameters: Probe: 40cmWorking voltage: DC 12V (board working range DC 9.5-15V)Control fan current: no more than 1.2A (larger current fan can be controlled by external relay)Color: as shownMaterial: PCandMetalCircuit consumption: no more than 20mAPWM signal mode: 25KHZ Vpp=5VTemperature probe : 50K B=3950Circuit operating temperature: -10 to 60Probe temperature resistance: small blackhead 120, ring probe 110Board size: 36mm x 13mm x 9mm (without interface), the fan interface extends 7mmFactory default settings: basic speed control output Po=20 percent , acceleration temperature Tu=30C, temperature control interval Td=5C (35C full speed), Tu-2C (28C) to turn off the fan, signal forward mode.Note:1. The fan current cannot 1.2A2. The controller does not participate in speed measurementSignal mode setting instructions:Forward mode: used for conventional fans, PWM positive changes, full output value is 100Reverse mode: used for conventional reverse timing fan, PWM reverse change, full output is 0Reverse 80 percent mode: for special reverse timing fans, reverse change, full output is 20Board working voltage range: DC9.5-15VAbnormal status indication:No output "1" light flashes quickly: supply voltage is too lowNo output "3" light flashes quickly: supply voltage is too high Package Contents:1 x Temperature Control Speed Controller Governor RegulatorOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.