Practically inaudible work The shovels at Shadow Wings 2 140mm PWM have been optimized to provide maximum air flow, which ensures quiet operation while at the same time solid cooling. Even at a maximum speed of 900 rpm, they operate with 14.9 dB(A). Perfect choice for all who value maximum silence in their PC enclosure. Anti-vibration concept The removable anti-vibration mounts on all four edges of the fan reduce vibrations carried to the computer enclosure. In addition, the fan is equipped with a rubberized frame that strengthens the anti-dirking concept and reduces vibrations to an absolute minimum. Rifle bearing technology Shadow Wings 2 140mm PWM is synonymous with exceptional reliability. This is achieved thanks to the high-quality rifle bearing technology, which provides a very long lifespan of up to 80,000 hours. Push-pin Mount With the Shadow Wings 2 anti-vibration system, the fan can be easily installed. Push-pin mounts provide very fast and safe installation without using screws. Variable fan speed function Pulse width modulation (PWM) allows compatible 4-pin controllers to intelligently change speed and thus minimize fan noise. With PWM, your system can accelerate cooling when it is needed, or work with maximum silence when it is not.