The Hyper Fan? Speed Controller can adjust the Hyper Fan? from 35% to 100% airflow. It is detachable from the fan and independent from the power cord. Fan will automatically operate at full power when used without the supplied speed controller. You can also get the Hyper Fan? Extension Cable to control your fan from a distance. Main cable is 5 m/16.4 ft long and connector cable is 15 cm/6 in long.