Features: Brushless for DC blower fan, widely used for picnics stove, campnig, charcoals starter, fire-starters replacement repair. 2-Wire terminated for power-supply, meet connection needs (red wire : positve,black: negative). High air volumn 2800rpm, reliable and safety to use. Ball-bearing, low noise and low power consumption with a long service for time. Easy installation, blower size 97x97x33mm, air duct diameter 33mm/26mm optional, USB 5V power-supply. Package Includes: 1 Piece for DC Brushless Fan with Air Duct Specifications: Main Material: Plastic Size: Approx. 9.7x9.7x3.3cm/3.82x3.82x1.30 inch Cable Length: Approx. 95cm/37.4 inch Air Duct Diameter: 26mm/1.02", 33mm/1.30"(optional) Bearing: ball-bearing Speed: 2800rpm Fan Speed:1-speed PowerSupply : USB 5V power-supply note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.