What this does for you Simple, reliable control of 12V fans and small 12V pumps using a standard 4‑pin output. Quickly reduce noise or increase airflow without changing fan wiring or software. Lets you power and regulate devices from common 5V USB sources (USB charging bricks or rechargeable batteries) using a USB‑C input and an internal boost converter. Key features and benefits Easy to use regulator with a standard 4‑pin output — plug in a 4‑pin PC fan and start controlling speed immediately. USB‑C female input: works with a wide range of USB‑C chargers, power banks, or USB power supplies for flexible power options. USB cable included so you can connect and begin regulating speeds right away. Smooth, continuous adjustment from 0% to 100% for precise control; turn clockwise to increase speed, counterclockwise to decrease. Built‑in DCDC boost converts 5V USB input to a stable 12V output and supports up to 8W of power — suitable for typical computer fans and small water pumps. Efficient power management reduces the need for dedicated 12V supplies in portable or low‑power setups. Compatibility and performance Designed for standard 4‑pin PWM fans and other small 12V devices that draw up to 8W. Use with USB‑C chargers, USB power banks, or rechargeable battery packs that provide a 5V output. Provides stable 12V output via an internal boost circuit; performance is limited to the 8W maximum rating. How to use 1. Connect a 5V USB power source to the regulator using the supplied USB cable into the USB‑C female port. 2. Plug the 4‑pin fan or 4‑pin device into the regulator's 4‑pin output. 3. Rotate the knob clockwise to increase speed or counterclockwise to reduce speed. Adjust smoothly between 0% and 100% as needed. Typical applications Quieting a desktop or test bench PC: lower fan speeds during light use to reduce noise, then increase speed under load for additional cooling. Portable cooling setups: power and control a computer fan or small pump from a USB power bank when an AC 12V supply is not available. Small water cooling or DIY pump control: regulate flow in small cooling loops or hobby projects that require up to 8W. What's included Fan regulator with 4‑pin output and USB‑C female input USB cable for immediate connection to a 5V USB power source This regulator provides a straightforward, portable way to power and control 12V fans and small pumps from 5V USB sources, offering smooth speed adjustment and an efficient boost converter rated up to 8W.