... *425*235mm 4) 2 speed choices DC brushless fan 12V cpu cooler fan Features 1.1700RPM, 3.9m/s wind speed ... blades diameter, 3 big blades and special blades angle design, a new generation of brushless DC motor, super strong wind, ultra quiet ... processing, low input voltage(12Volt) for fan working, safe. 3.New generation of DC brushless technique, lower running voltage and current ...