PWM 4-Pin Fan Speed Controller USB to 12V Type-C Adapter

Take Full Control of Your Cooling System

The OULLX 4-Pin PWM Fan Speed Controller is a compact, versatile adapter designed for DIY PC builders, water-cooling enthusiasts, and electronics hobbyists. It converts a standard 5V USB input to a 12V output, giving you the power you need to run fans, water-cooling radiators, and water pumps — all from a convenient USB or Type-C power source.

With built-in PWM (Pulse Width Modulation) speed control, you can precisely dial in the performance of your cooling components, keeping temperatures in check while managing noise levels. CE and RoHS certified for your peace of mind. Made in Mainland China.

⚡ Important Power Notes

• Input: 5V USB | Output: 12V DC
• Requires a minimum 5V / 2A input to achieve maximum output of 12V / 0.67A / 8W
• Conversion efficiency up to 80% — e.g. 5V/1A input yields 12V/0.33A/4W output
• Always ensure your USB power source meets the required input rating for optimal performance

Key Features

• 🔌 USB to Type-C Power Supply — compatible with most standard USB power interfaces
• ⚙️ 4-Pin PWM Control — precise fan speed regulation for quiet, efficient cooling
• 💧 DIY Water-Cooling Ready — supports radiators and water pumps in custom builds
• 📦 No Assembly Required — plug-and-play setup right out of the box
• ✅ CE & RoHS Certified — meets international safety and environmental standards
• 🧰 Compact, lightweight design ideal for tight DIY builds

Specifications

What's in the Box

• Speed Controller × 1
• USB Cable × 1

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Frequently Asked Questions

Q: What is the minimum USB power input required to get the full 12V output?

A: You need at least a 5V / 2A USB power source to achieve the maximum output of 12V / 0.67A / 8W. Using a lower-rated power supply (e.g. 5V/1A) will result in a proportionally reduced output (12V / 0.33A / 4W), which may not be sufficient for higher-power fans or pumps.

Q: Is this controller compatible with standard PC water-cooling pumps and fans?

A: Yes! The OULLX PWM Fan Speed Controller is designed for DIY water-cooling setups, supporting 4-pin PWM fans, radiator fans, and water pumps. As long as your component's power requirements fall within the controller's output range (max 12V / 8W), it will be compatible.

Q: Does this adapter require any setup or assembly?

A: No assembly is required. Simply connect the included USB cable to a compatible 5V USB power source, plug in your 4-pin fan or pump, and adjust the PWM speed dial to your desired setting. It's a true plug-and-play solution for DIY builders.

Q: What certifications does this product carry?

A: The OULLX 4-Pin PWM Fan Speed Controller is CE and RoHS certified, ensuring it meets European safety standards and is free from hazardous materials, making it a safe and compliant choice for your DIY projects.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.