USB fan for notebook,laptop,PC 1.DC brushless motor 2.Voltage:DC ... 5V4)power:2.5+5%W 5)Applicable for:Computer,USB electric appliances6)Economize on energy, environmental protection, low noise, ... balance before shipment 2)ESCROW:ESCROW BY ALIBABAApprove:CE&RoHSComputer/ notebook /laptop/in car or power with adapter.2.Power consumption ... is the first.Please contact me,thanks 4 inch usb desk fan ---4A1