Key benefits Accurate temperature based fan control: precise temperature setting and automatic speed regulation for standard fourwire chassis fans and CPU fans, powered by a DC 12V supply. Flexible operating modes: integrates manual speed adjustment with automatic temperaturecontrolled speed regulation for versatile cooling management. Reliable alarm system: audible and visual alarm for open channel fan failures; includes a buzzer option; alarm clears automatically when the affected fan resumes operation. Compact and easy to install: small form factor with straightforward mounting provisions, suitable for tight PC builds and compact enclosures. Clear electrical and physical specs: robust support with peroutput up to 4 A, total bus current up to 9 A, and a compact board footprint for easy integration. Specifications Operating voltage: DC 12 V Output current: maximum 4 A per output Total bus current: up to 9 A Control method: manual speed regulation and automatic temperature control and speed regulation Alarm: audible and visual alarm for open channel fan failure; works with buzzer; alarm automatically clears when the fan recovers Board size: approx 5.3 x 4.5 cm (2.0 x 1.7 inches) Positioning holes: 44 x 37 mm (1.7 x 1.5 inches) Positioning hole diameter: 3 mm Dimensions and mounting Board size: approx 5.3 x 4.5 cm Positioning holes: 44 x 37 mm Hole diameter: 3 mm Use scenarios Desktop gaming or workstation PC: manage multiple fourwire chassis fans and a CPU fan with precise temperaturebased speed control, while having a builtin alarm to alert you of any fan failures. Home server or NAS: maintain stable temperatures in a compact enclosure by combining manual and automatic fan control, with a visible and audible alert if a fan stops, ensuring critical services stay within safe temperatures. Small mining rig or compact server setup: efficiently regulate fan speeds across several fans at DC12V, with quick response to temperature changes and clear fault notification to minimize downtime.