DC 12V 4-Wire PWM PC CPU Fan Speed Controller with Temperature Control

1. The controller regulates the speed of standard 4-pin Intel PWM fans only; it does not turn fans off. It features full digital control, precise temperature setting, and accurate speed regulation. It supports both manual speed control and automatic temperature-based speed control. Manual speed adjustment ranges from 10% to 100%, in 5% increments. Automatic temperature control begins at 30°C, with 49 adjustable temperature zones. 2. Power input: Red and black wires connect to a 12V DC power supply. A 3-pin connector with a 2510-3P plug is included for compatibility with motherboard 3-wire fan headers (tachometer signal only). A large 4-pin interface allows convenient power connection from the PC case. 3. Temperature probe: The small black probe has a short tip and low thermal mass, enabling fast response and suitability for narrow spaces or ambient air temperature measurement. The ring-type probe is housed in a 4.2mm-diameter metal ring, designed for secure mounting—e.g., onto heatsinks or other heat-emitting surfaces—using screws. 4. Integrated manual/automatic control: Manual mode operates without the temperature probe. Press or double-press the up/down buttons to adjust speed. Each adjustment remains active for 20 seconds before auto-saving. During this period, LED #2 flashes rapidly (indicating temperature control is inactive). Flashing stops once settings are saved. LEDs #3 and #1 remain steadily lit when maximum or minimum speed limits are reached. 5. With the temperature probe installed, the manually set speed serves as the base (minimum) fan speed. When ambient temperature exceeds the configured start temperature, fan speed increases smoothly with rising temperature. At or above the full-speed temperature (start temperature + temperature range), the fan runs at maximum speed.