Item Type: Cooling Fan Inner Ring Diameter: Approx. 10.8cm/4.3in Outer Ring Diameter: Approx. 12cm/4.7in Number of Fan Blades: 7 Blades Interface: D Type Large 4PIN Serial Interface Noise Level: 23dB Airflow: 45 CFM Rated Voltage: DC 12V Rated Current: 0.17 0.03A1Large air volume design, with 7 blades, the cooling fan can achieve large?volume heat dissipation 2Enhanced frame design, more solid, can effectively protect the fan from deformation 3Cool appearance, shockproof and silent working mode to prevent you from being disturbed by fan noise 4Unique double ball bearing design, 60,000 hours of life, long?term use, 2600 rpm violent fan, strong wind 5Suitable for the heat dissipation of the computer case to prevent the computer from working for too long and overheating 1 x Cooling fan 4 x Screws