SHADOW WINGS 2 120mm PWM WORLD-CLASS QUIET AND SOLID COOLING be quiet! Shadow Wings 2 120mm PWM offers whisper-quiet operation and reliable cooling at low revolutions per minute. Key features include: Low-noise operation of up to 15.9dB(A) Airflow-optimized fan blades Anti-vibration mounting system prevents transmission of vibrations Rubberized fan frame minimizes vibrations High-grade rifle-bearing technology Secure and easy installation with push-pins PWM controlled fan speed through the motherboard