be quiet! Shadow Wings 2 140mm offers whisper-quiet operation and reliable cooling at low revolutions per minute. Key features include:

Low-noise operation of up to 14.7dB(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
Product conception, design and quality control in Germany
3-year manufacturer’s warranty
Shadow Wings 2 fans are the perfect choice for all who appreciate maximum silence for their PC case.