Features: Precise engineered DC12V 3A 4wire fan controller integrates digital temperature display and auto shutoff function, enabling accurate RPM adjustment and energy efficient operate for optimized thermal management. Features high precise thermal probe monitoring with 0-100 adjustable speed ranges, compatible for most 4wire fan through stable DC12V input in compact PCB/PVC housing. Essential for PC enthusiasts upgrading cooling systems, appliance technicians maintaining ventilation units, and lab operators managing equipment temperature stability. Optimizes airflows in computer cases, electronic cabinets, and industrial settings where real time temperature tracking and customizable fan performances are critical. Combines technology with LED temperature readout for instantly environment analysis, ensuring efficient heat dissipation while extending fan lifespans through intelligent speed adaptation. Specifications: Component: PCB, PVC Size: Approx.53x18.5mm/2.08x0.83inch Supply voltages and current: DC12V3A Voltages ranges: DC8V~16V frequency:25KHZ(plus or minus 1KHZ) Option Type:1set,2set; Applicable scenario:Computer host: Effectively reduce CPU or GPU temperature and improve systems stability. Package Includes: Package A 1pc Temperature Speed Controller 1pc Detection Line 1pc Connection Line Package B 2pc Temperature Speed Controller 2pc Detection Line 2pc Connection Line note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.