High performance 12cm fan with S-FLOW blades supplying 30% more airflow than a standard fan at the same speed. The greater performance combined with PWM automatic speed control allows the fan noise to be kept to a minimum.The Viper fan creates more focused airflow providing blind-spot cooling, which makes it an ideal solution for a case or heatsink fan. HDB (Hydro Dynamic) bearings extend fan life and further enhance noise reduction. Killer Viper yellow colour makes this fan distinctive and unique. Features:- High performance 12cm fan in killer VIPER yellow colour- S-FLOW fan blade design delivers 30% higher airflow- Super silent with PWM auto speed control- Hydro Dynamic Bearing extends fan life up to 50,000 hoursSpecification:- Dimension: 120 X 120 X 25mm- Fan speed: 600 -1900 RPM- Max airflow: 83.63 CFM (141.75 m3/h)- Max static air pressure: 2.98 mm H2O- Noise level: 6.9 -28.9 dB(A)- Fan life expectancy: 50,000 hours- Connector: 4pin PWM