... plastic material 2.Cup shape fan,power by USB,smart cooling gift 3.Ultra-quiet 2011 hot sell ... brushless motor, strong wind, super quiet. 2.5V USB(cable length:1.2m) power supply, plastic shell, ... can be used continuously with long time. 5.Smart support and pedestal design, noble and elegant. 6 ... and refreshing, comfortable. 11.USB plug and play,no external power needed,USB power adapter required for the ...