- Stepless speed control allows you to adjust fan speed seamlessly between 2.5V and 8V, providing a comfortable airflow tailored to your needs. - Constructed from durable ABS material, this controller features a USB input and an intuitive twist operation. Turning clockwise increases speed, while counter-clockwise decreases it, ensuring easy and convenient adjustments. - To set up, simply plug the controller into a phone power bank, connect your fan's USB plug to the controller's USB port, and use the adjustment knob to control the fan speed. - Compatible with a supply range of 4V to 12V, this device has a rated power of 5W, ensuring reliable performance without the risk of overload. Use Scenarios: 1. Perfect for use in a home office, allowing you to adjust your fan speed easily while focusing on your tasks. 2. Ideal for small spaces like dorm rooms or bedrooms where personalized airflow is essential for comfort during sleeping or studying. 3. Useful during outdoor activities like camping, where you can regulate the fan speed from a portable power bank for a refreshing breeze. Choose this versatile fan speed controller for easy and efficient airflow management tailored to your specific needs.