Arctic F12 Pro Pwm 120mm Case Fan 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 & minimizes the noise level. Patented PWM Sharing Technology (PST) Lowers Noise If you want to improve the cooling efficiency of your computer you get several case fans working in parallel (since it takes 10 fans to double the noise level). But what does it help if they don't work together? The PST assures that all of your fans listen to one control signal. E.g. you share the CPU Cooler's PWM signal & assure that your case fans stand down at low load & spin up whenever necessary. Innovative Design Enables Quiet & Efficient Ventilation The innovative design of the fan blades improves the air flow & facilitates a highly efficient ventilation. The impeller was designed with a focus on minimzing the noise level yet delivering the desired airflow & pressure. Extented Life Span with Japanese Dual Ball Bearing The premium quality Japanese dual ball bearing allows continuous operation 24/7 without the slightest compromise in performance. Dust & high temperature are affecting this bearing a lot less than generic sleeve or one ball bearings & thus make it the perfect choice if reliability is key. The CO case fan's life span is up to 5 times longer compared to models using a generic bearing. Performance Fan Speed: Air Flow: 74 CFM / 126 m&sup 3;/h (@ 1, 350 RPM) Noise Level: 0.3 Sone (@ 1, 350 RPM) Electrical Requirements Typical Voltage: 12V DC Start-up Voltage: 6.0V DC (@ 100% PWM) Cable Length: 400mm Sub PST Cable Length: 50mm Connection Motherboard: +12V DC PWM control signal 4-pin socket 6 Years Limited Warranty