Magnetic Bearing Harnesses magnetic levitation technology to provide lower noise higher performance and a longer lifespan Custom Rotor Design Delivers the perfect balance between high static pressure and high airflow operating flawlessly in the most challenging environments Extensive Control Range A 2000 RPM PWM control range gives you total control between low noise and absolute performance. With a 2000 RPM control range The ML Series fans deliver total control between low noise and airflow without compromise. Contents and Specifications Package contents (x2) ML120 120mm PWM Premium Magnetic Levitation Fan . Fan mounting screws . System Requirements Motherboard with an open standard 4-pin fan connector