Adjustable airflow: This USB fan regulator lets you tailor comfort by switching between strong and gentle breezes to suit your environment. Smooth voltage control: Provides a stepless output voltage range from 5V to 8.0V for precise air volume adjustment and enhanced cooling efficiency. Userfriendly knob function: Increase airflow by turning clockwise and decrease it by turning counterclockwise, with an integrated on/off switch for convenient operation. Compatibility: Designed to work with standard 0V USB fans, making it a practical addition to your fan setup. Use scenarios: Desk or office cooling: Set the airflow to a comfortable level while working or studying. Laptop and electronics cooling: Finetune airflow for devices that need targeted cooling. Portable or dorm room use: Use with a USB power source for flexible, onthego cooling.