EL-H001 Special design provides the airflow for massive heat dissipation The heatsink is made for high for high density Aluminum extrusion and achieved excellent heat dissipation Easy installed design cutting installation steps and saving your time,fascination appearance Hign performance and ultra silence Fan size:5cm and 6cm Fan speed:2400RPM+-10% Max Air Flow:24.64CFM Life Expectancy: Rated Voltage:12V DC Noise Level:26.0dB