USB Fan Speed Controller Module Key benefits and why you need it: - Smooth, stepless control of USB fan speed for precise cooling and quieter operation. - Expands usability of fixed-speed USB fans by allowing adjustable airflow to match your needs. - Compatible with common USB power sources for easy plug-and-play use. What makes this module stand out: - Wide input range supports DC4-12V input, allowing use with computer USB ports, phone chargers, and power banks. - Smooth output voltage from DC2.5 to 8.0V for a larger adjustable speed range than two-speed fans. - Built on a high-frequency switching regulator principle to control fan speed by adjusting output voltage. - Simple knob control with push-button on/off function for fast, intuitive adjustments. Main specifications: - Product name: USB Fan Speed Control Module. - Input voltage: DC4-12V. - Output voltage: DC2.5-8.0V. - Output power: 5 W (do not overload). - Designed for common 5.0V USB fans on the market. How to use: - Plug the male USB plug of the speed controller into a USB power source such as a phone charger, power bank, or computer USB port. - Plug the fan USB connector into the female socket of the controller. - Rotate the knob clockwise to increase fan speed and airflow, and rotate counterclockwise to decrease speed. - Press the knob to switch the module on or off. Important note: - If your fan has a built-in two-speed switch, set the fan to the first gear before using this controller, otherwise speed adjustment may not work as expected. Practical applications: - Desk cooling: Connect to a USB charger or computer to adjust airflow for personal comfort while working. - Portable cooling on the go: Use with a power bank to control fan speed during outdoor activities or travel. - Electronics cooling: Provide adjustable airflow to small electronics or enclosures from a USB power source to reduce noise and tailor cooling. Additional features: - Plug-and-play design for quick installation and removal. - Broad compatibility with multiple USB power sources for flexible use. This USB fan speed control module provides reliable, adjustable cooling with simple knob operation and wide compatibility for everyday and portable applications.