1~4PCS Portable 4 inch USB Mini Fan DC 5V Small Desk Fan 4 Blades Cooler Cooling Fan Mini Super Mute Silent Fans For Description:   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: Description:   100% brand new, high quality   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