This DC12V governor can be controlled according to the ambient temperature of the fan speed, no manual control, automatic stepless speed, the higher the ambient temperature, the faster the fan speed control, saving energy and reducing noise. Whether it is a 2-wire, 3-wire or 4-wire fan (only connect power cable), whether PWM or brushless fans, as long as the fan voltage is within 12V, current less than 1A, the governor apply! Also can drive a of fans (total current must <1A). 3-wire/4-wire fans only need to connect the fan's power cord to the controller The temperature sensor is connected with a cable in the form of mounting holes to facilitate detection of the temperature specified temperature point.

Temperature probe is sealed with epoxy resin, waterproof and moisture-proof, the temperature probe maximum use temperature of 110 degrees.
Sensor probe length: 300mm/ 11.5 inch. Dual working mode optional, fixed starting temperature or adjustable starting temperature. Fixed mode temperature and temperature of 30°C(86°F), the governor control fan start, 30 to 50 degrees fan speed linear increase, 50°C(122°F ) above the fan at full speed.
Adjustable mode start-up temperature range: 15 to 50 degrees, full speed range of 35 to 70 degrees (start and full-speed temperature difference of 20 degrees).
Board size: 1.77 x 1.0 x 1.18 inch/ 45x25x30mm (LXWXH), M3 mounting hole. ( Note that It is best to read the main picture instructions before use)