This fan controller module provides precise, stepless speed control for small cooling fans. It supports 4-12V power input and up to 5A current, with a rated power of 5W. The output can be adjusted from 2.5V to 8V for stable, smooth fan operation. The control knob also functions as a switch, and the housing is built from PC and metal for durability. How to use - Plug the controller into a phone or charging device. - Plug the fan's USB plug into the USB port on the controller. - Turn the adjustment knob to set the speed: clockwise to increase, counterclockwise to decrease. The knob also has a switch function. Motor regulator specifications - Power supply range: 4–12V - Rated power: 5W (not overloaded) - Maximum current: up to 5A - Potentiometer with switch function - Housing: PC plus metal, durable and reliable Output and performance - Stepless speed regulation - Output voltage range: 2.5V–8V for stable, adjustable fan speed - Enables precise control of fan speed to suit cooling needs and noise preferences Box contents - 1 x fan controller module Use scenarios - DIY electronics or compact computer projects: use to control a cooling fan in a small enclosure, allowing temperature-based or manual speed adjustments with quiet operation. - Noise-sensitive applications: set the fan to a low, steady speed during idle or light use to reduce noise while maintaining cooling. - Portable or USB-powered projects: integrate with power banks or USB power supplies to adjust fan speed on the fly for balanced cooling and power consumption. Key benefits - Precise, adjustable control over fan speed with a simple knob - Wide compatibility with 4–12V power sources and current up to 5A - Durable construction using PC and metal - Integrated switch function for convenient on/off control - Stepless regulation from 2.5V to 8V provides smooth, stable performance - Easy integration in DIY projects, enclosures, or portable devices This description preserves the original product’s specifications and functions while presenting a clear, customer-friendly overview with practical use cases.