Take control of your cooling system with this versatile USB fan speed controller. Featuring an intuitive rotary knob design, this DIYMORE controller offers smooth, infinite speed adjustment for your USB-powered fans. The device supports both USB Type-A and Type-C connections, making it compatible with a wide range of devices including laptops and phones. Operating at 5V/2A with PWM control technology, it delivers precise speed regulation from zero to maximum. The sleek black housing includes LED indicators to show operational status, while the robust construction ensures reliable performance. Simply turn the red-accented knob clockwise to increase speed, counterclockwise to decrease, and fully counterclockwise to switch off. The controller's extendable cable socket design provides flexibility in placement and setup. This compact unit is perfect for optimizing airflow in custom cooling solutions, whether for electronic projects, computer setups, or other USB-powered cooling applications.