The Pure Wings 2 140mm 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 80,000 hours- Even at maximum speed, operates at only 19.8dB(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 manufacturer’s warrantyCombining outstanding reliability, quiet operation, and a great price-for-performance ratio, Pure Wings 2 140mm PWM is unique in its class. They are the ultimate reason to put well-known be quiet! silent cooling in your PC.