The Pure Wings 2 92mm PWM fans bring famous be quiet! silent cooling to entry level computing yet are also appropriate for gaming and multimedia systems. The most important features include:- Nine airflow-optimized fan blades reduce noise-generating turbulence- Long life rifle-bearing gives an operating lifetime of 80000 hours- Even at maximum speed operates at only 19.6dB(A)- Especially recommended for use in water cooling and CPU cooling builds- PWM controlled fan speed through the motherboard- German product conception design and quality control- 3-years manufacturers warrantyCombining outstanding reliability quiet operation and a great price-for-performance ratio Pure Wings 2 92mm PWM is unique in its class. They are the ultimate reason to put well-known be quiet! silent cooling in your PC.