- Compatibility with USB Fans : This stepless speed controller is designed specifically for 5V USB-powered fans, allowing you to easily connect it to laptops, power banks, and USB chargers. Enjoy customized cooling anywhere you need it. - Precise Speed Control : Take full command of your fan's airflow with the intuitive dial. Experience smooth adjustments for optimal comfort tailored to your preferences at any moment. - User-Friendly Operation : Featuring a built-in switch, this speed controller simplifies your experience. Effortlessly turn your fan on or off and adjust the speed without complicated settings, making it suitable for all users. - Durable Construction : Made from high-quality materials, this fan speed controller is built to last. Its sturdy design ensures consistent performance, providing reliable support for all your cooling needs over time. Use Scenarios : 1. Home Office : Keep your workspace comfortable by adjusting your fan speed to suit your needs while working on your laptop. 2. Outdoor Activities : Connect the controller to a portable power bank and bring personalized cooling to picnics or camping trips. 3. Travel : Perfect for hotel stays, use this compact controller to manage your fan's speed for a restful night’s sleep.