Pure Wings 2 120mm PWM fans bring famous be quiet! silent cooling to entry level computing, yet are also appropriate for gaming and multimedia systems. 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 20.2 dB(A) PWM controlled fan speed through the motherboard German product conception, design and quality control Pure Wings 2 120mm PWM fans offer outstanding reliability and quiet operation at great price-for-performance ratio. They are the ultimate reason to put well-known be quiet! silent cooling in your PC. VERY QUIET OPERATION