Features： Super quite design. Pitch angle can be adjusted up or down. With key switch. USB powered, no external power supply required. Plug and play, easy to install. Durable soft fan blades keep you from harm. Specifications: Super quite design. Pitch angle can be adjusted up or down. With key switch. USB powered, no external power supply required. Plug and play, easy to install. Durable soft fan blades keep you from harm. Super sound-off. The USB transformer can purchase power by itself. It is recommended to purchase a transformer with 5V or more than 1000MA. USB power plug Body size: 150 x 80 x 145 mm Fan diameter: 96 mm Power Supply: DC5V Power consumption: 2.5±0.25W Wire length: 84 cm Quantity: 1 Package Included: 1*USB fan