RUNCCI-YUN 3Pcs USB Fan Speed Controller - 5W DC 5V Regulator

Take full control of your airflow with the RUNCCI-YUN 3-piece USB fan speed controller set. Designed for common 5.0V USB fans, these stepless regulators allow you to adjust wind speed from weak to strong with a simple turn of the knob. Whether you need a gentle breeze or a powerful gust, this device provides precise control to suit your comfort level. Each controller features a built-in switch for easy power management and is built with pure copper inner conductors for reliable performance. The unit operates within a DC 4V-12V range, providing an output voltage of DC 2.5V to 8.0V. This makes it a versatile tool for managing small desktop fans, cooling accessories, or personal fans powered by phone chargers or power banks. To use, simply plug the controller into your power source and connect your fan to the USB port. For fans with pre-set speed settings, ensure the fan is set to the first gear to allow the stepless adjustment to work correctly. This compact regulator is an essential accessory for anyone looking to customize their cooling experience.