Features: Effortlessly control fan speeds with this fan speed controller, suitable for 12 to 60V systems and supporting up to 3A current for precise airflows management in various applications. Features a 5V/25kHz signals output with adjustable duty cycle (initial ranges 0% to 60%), paired with a compact 28.5x21mm design and 15mm rotary knob for seamless installation in 7mm apertures. Designed for electronics enthusiasts, PC modders, and industrial technicians requiring stable thermal regulation in projects, cooling systems, or machinery ventilation. Optimize airflows in computer cases, server racks, workshop tools, or HVAC setups where stable temperature control and space efficient installation are critical. Safely handles large power fans via direct power wiring for currents exceeding 3A, while its electric compatibility ensures versatile integration across 12 60V environments. Specifications: Product Name: Fan Controller Working electric : 12V ~ 60V greatest current: 3A Signals mode: 5V, 25kHz Circuit board size: about 28.5mm x 21mm/1.1x0.83inch Knob screw extension length: 15mm Fixed hole diameter: 3mm Type: 2 for option Package Includes: 2xController Module note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.