Versatile Power Supply Designed for versatility, this fan speed switch module supports a wide power supply range of DC 4~12V, making it compatible with multiple USB sources. Compact and Portable Design The compact size of this mini USB fan regulator makes it easy to carry, perfect for your on-the-go cooling needs. Stepless Speed Regulation Enjoy perfect control over your fans airflow with our stepless speed regulator, offering smooth transition from low to high speeds. 5V USB Fan Compatibility Specifically designed to work with common 5V USB fans, this module ensures compatibility and ease of use. User-Friendly Operation The intuitive knob design allows for easy adjustment of air volume, providing a convenient way to manage fan speed. Wide Voltage Range With a DC output range of 2.5~8.0V, this module ensures optimal performance under various devices and conditions.