Features: This fan speed controller utilizes advanced temperature sensing technology to automatically adjust 12V/24V fan based on environmental heat, ensuring optimal cooling while saving energy through intelligent operational. Featuring double operating modes (fixed 30℃ startup or customizable 10-50℃), seamlessly controls 2/3/4 wire fans with ±1℃ using its sensory. Ideal for PC builders, industrial equipment technicians, and electronics enthusiasts requiring precise thermal management in confined spaces like computer cases, server racks, or cooling systems. Perfect for regulating gaming PC, printer enclosures, hydroponic setups, or any application demanding temperature responsive fan control between 20℃-110℃ environments. The included high accuracy waterproof probe enables versatile temperature monitoring, liquid coolant systems, or machinery surfaces, preventing rapid fan cycling during temperature conditions. Specifications: Component:ABS Size:Approx.56x35mm/2.2x1.37inch Package Includes: 1PC Speed Regulation Module note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.