Features: The USB Adjustable Speed Detachable Blower features a 75mm duct design with 5500 RPM for efficient heat dissipation, smogs exhaust, and combustion assistance, offering a removable fan unit for easy cleaning and maintenance. Equipped with a 12V input port and USB 5V boosts speed control cable, this compact blower supports power from USB adapters or portable chargers, ensuring hassle release installation in confined spaces. Designed for craft enthusiasts, electronics technicians, and blacksmiths requiring precise airflows control in equipment racks, printers, or ventilation systems. Optimize thermal management in workshops, server cabinets, or outdoor BBQ setups with its focused air delivery systems that enhances cooling and smogs extraction efficiency. Built with sturdy ABS plastic housing, this multifunctional duct fan delivers 5500 RPM airflows for professional grades ventilation while maintaining portability for mobile applications. Specifications: Materials: plastic Rotation speed: 5500r/min Color; black USB input 5V2A Cable length 1.5m/59.05inches Diameter: 75mm/2.95inches Big wind pipe diameter: 3cm/1.18inches Small air duct diameter: 2.8cm/1.1inches Package Includes: 1Set USB Speed Control Cable + 75mm Duct Fan note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.