Very Quiet Work Excellent price/performance ratio. The Pure Wings 2 80mm PWM fan even at maximum speed, only works at 19,2dB(A). Perfect choice for quiet home and office computers as well as gaming and multimedia systems. Optimised fan blades For even better cooling. Thanks to nine fan blades with optimized surface air flow is increased, noise-generating turbulence is minimized and air pressure increased. This function is the key to effective cooling. Variable speed function Variable fan speed and noise level. Pulse width modulation (PWM) allows compatible 4-pin controllers, including built into multiple main panels, intelligently change the speed and thus the fan noise level. With PWM your system can increase cooling when needed or work in maximum mute mode. rift bearing technology It gives the fan a very long lifespan. Pure Wings 2 80mm 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.