90mm 500 to 5000 RPM 10.4 to 128 CFM 2 Ball (Japanese ball bearing) 57.2 dBA PWM Fan Speed Control Function Design for On Demand Cooling Performance Bigger Speed Range Designed for Better and Precise On Demand Cooling Need. Massive Airflow of Up To 318 CFM Japanese 2 Ball Bearing Designed for Greater Stability at High Speed, and for Higher Performance with Extended Lifespan. Certified By: UL, FCC, CE, RoHS, WEEE, REACH