USB fan, mini usb fan with hub, usb hub, desk fan, computer fan, notebook fan
with 4 port USB HUB(1.1)
powered by USB port

USB fan, mini usb fan, usb hub, desk fan, computer fan, notebook fan
with 4 port USB HUB(1.1)
powered by USB port
directly plug into USB port on nobtebook or PC.
No external power supply is needed.