Built with the same design as the Air Penetrator AP121 computer case fan, the USB version retains all the great qualities that made original fan a hit with computer enthusiasts. Instead of using it inside a computer case, the AP121-USB is made for use on a desktop to cool the computer users. Requiring less than 1W of power from the USB port, it is also a great alternative to using air conditioning or traditional house fan in the home, office, or on the go with a laptop