... by USB port 3.flexible metal neck 4.soft fan blade,no hurt 5.on/off switch, plug and ... play USB fan with program flashing word, can show customer's word ... as required1.mini usb fan for PC, laptop, office use2.powered by PC USB ... air-condition for cool environment anymore, just with DC 5V fan, energy saving.10.Working Volt: DC 5V, Working current: ...