4-Pin PWM Design and Daisy Chain Capability  Pulse Width Modulation (PWM) allows motherboards to alter fan speed RPM dynamically and 3-Pin fan with standard case  Long Service Life The Fluid Dynamic Bearing comes with an oil capsule that avoids lubricant leakage. Thus this bearing is as quiet as a sleeve bearing but comes with a significantly higher service life Innovative Design Enables Quiet and Efficient Ventilation The innovative design of the fan blades improves the air flow and facilitates a highly efficient ventilation. The impeller was designed with a focus on minimzing the noise level yet delivering the desired airflow and pressure. Two Way installation Blow warm air out of the case Draw cool air into your caseProduct Overview Long Service Life The Fluid Dynamic Bearing comes with an oil capsule that avoids lubricant leakage. Thus this bearing is as quiet as a sleeve bearing but comes with a significantly higher service life. Perfect Case Fan Regulation with PWM The PWM function allows the motherboard to run the fan precisely at its necessary speed. This guarantees the required cooling and minimizes the noise level. Innovative Design Enables Quiet and Efficient Ventilation The innovative design of the fan blades improves the air flow and facilitates a highly efficient ventilation. The impeller was designed with a focus on minimzing the noise level yet delivering the desired airflow and pressure. Features • Extremely Quiet with low noise impeller • High airflow and static pressure • Fluid dynamic bearing ensures extended lifespan Edition F12 PWM Pack Type      Includes  1 x 120mm Fan/s Individual Fan Specifications Fan Diameter 120mm Fan Depth  25 mm Fan Speed 1350 rpm Fan Blades  9 PWM    Yes Fan Specialization      Airflow    53 CFM Air Pressure      Sound Level (dBA)      Sound Level (Sone)    0.3 @ 1350rpm Sone Motor Type      Bearing Type    Fluid Dynamic Bearing Manual Speed Controller    No Material    Plastic Fan Colour    Black/White LED    No LED Colour      MTBF      Fan Fixing    Screw Fixing Cable length    400 mm Connectors    1 x 4-pin