High performance cooling fan, 120x120x25 mm, 12 V, 4-pin PWM, max. 1200 RPM, max. 18.1 dB(A), >150,000 h MTTF Renowned NF-S12B high-end 120x25mm 12V fan, more than 100 awards and recommendations from international computer hardware websites and magazines, hundreds of thousands of satisfied users Airflow-optimised blade design with high CFM and outstanding quietness of operation, ideal for low-noise case cooling, chassis ventilation and other applications with low airflow resistance 1200rpm 4-pin PWM version with excellent balance of performance and quietness, supports automatic motherboard speed control (powerful airflow when required, virtually silent at idle) Streamlined redux edition: proven Noctua quality at an attractive price point, wide range of optional accessories (anti-vibration mounts, S-ATA adaptors, y-splitters, extension cables, etc.)