Features: Experience precise control with USB Charging Power Cord featuring 62 gear speed control button for fan speed adjustments,suitable for 18V fan and blowers. This USB Speed Controller offers a wide output from 5V-18.8V, adjustable across 62 gear, with a digital display indicating speed setting. Perfect for enthusiasts and hobbyists efficient fan speed regulation in their electronic projects or cooling systems. Suitable for use in various environment, from home workshops to office space, ensuring airflow and cooling performances for your devices. With its memory function, this USB power cord retains your last speed setting, providing convenience and efficiency you power your fan or blower. Specifications: Component:Plastic Length:Approx.25cm/9.84inch Package Includes: 1Pc Extension Cable note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.