... by USB port 3.flexible metal neck 4.soft fan blade,no hurt 5.on/off switch, plug and ... word, can show customer's word as required1.mini usb fan for PC, laptop, office use2.powered by PC USB 5 ... use it.8.low noise and heat operation, good for study, work or game.9.USB plug and play, ... is not necessary with air-condition for cool environment anymore, just with DC 5V fan, energy saving.10.Working Volt: DC ...