AS-71 USB to Fan Adapter Cable
Turns your 3 or 4 pin computer case fan into a USB powered fan. Built in voltage IC boosts the 5V of USB ports to 12V to ensure your fan spins at its capable full speed. Normally a USB port will only output 5V and while it will power your fan, it will not spin as fast and push as much air. With this adapter you get the full 12V required by most fans.