AeroCool designed SilentMaster 200mm Blue LED fan with large blades for better airflow and lower noise level. Aerodynamic fan blades designed to minimize turbulent. Only at 800 RPM generate enormous airflow up to 76 CFM with low noise level at only 18dBA. Include 3 pin to 4 pin Molex converter and 4 screws. Customer Service: Supportataerocool.us or call 510-661-9948. RMA Service: RMAataerocool.us or call 510-661-9948.