AS-71G2 USB to Fan Adapter Cable
Convert any 3 or 4 pin computer case fan to a USB fan. This cable takes a USB 5V and bumps it up to 12V allowing your fan to spin at full speed. Most other cables on the market will only supply 5V back to the fan leaving your fan spinning at less than optimal speeds. A built in fan controller also allows you manually adjust the speed and airflow.