Features: Experience precise fan control with this 4wire speed controller offering stepless speed adjustment for high performances server cooling fans, featuring essential input reverse connection protections. This module boasts broad compatibility for both 3wire and 4wire server fan, incorporates reliability reverse polarity protections circuitry, and operates with minimal noise output through optimized algorithms. Ideal for server administrators managing data center equipment, PC enthusiasts building cooling solution, and technicians maintaining industrial or communication devices requiring stable thermal management. Effectively regulates cooling systems in demanding environments including rack servers, high performances computing setups, networking cabinets, and electronics projects where controlled airflows is critical. Its simplifies integration into existing setups, while the efficient control significantly reduces operational noise during low speed fan operate, enhancing workspaces comfort. Specifications: Component: PCB, metal Size:Approx.31x26x14mm/1.22x1.02x0.55inch Working voltages: DC12V Fan current: Within 5A Protections: Input reverse connection protections ranges: 25KHZ Option Type:1pc,3pcs; Applicable scenarios:projects,Computer cooling,Electronic equipment; Package Includes: Package A 1pc Stepless Speed Regulator Package B 3pc Stepless Speed Regulator note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.