Enermax T.B. APOLLISH 18cm Cooling Fan - Electric Blue (UCTA18A-BL) 18/20cm giant fan for better cooling performance Compatible with 18cm and 20cm mounting holes Shift Speed Control providing 3 cooling modes Patented circular type Electric Blue LED with up to 18 diodes. Vortex frame design concentrating airflow to cool hotspot Focus blades centering the light to increase brightness Turbine blades for high-pressure airflow