Features:brand new and high quality9-blade design offers a higher airflow and quiet cooling solution for the best performance.PWM capabilities built-in to precisely control the speed to achieve optimized fan curve.Rigid frame design and included rubber dampeners helps to prevent vibration.Low-noise operation without sacrificing performance.The hydraulic bearing design,it has a large oil storage space and an oil seal cover, which can reduce lubricating oil over flow, while reducing friction and noise. Specifications:Material: ABSColour: Black,whiteProduct size: approx. 120x120x25mm/4.72x4.72x0.98inRated voltage: 12V for DCConnector: 4pin (pwm)Bearing type: hydraulic bearingSpeed: 2200rpm, 3000rpm (optional)Air volume: 55~78CFM (2200rpm) ; 60~108CFM (3000rpm )Noise: 18~32db (a) 10% (2200rpm) ; 20~40db (a) 10% (3000rpm ) Note:No retail package.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes:1 X CPU cooler