Rigid brass housing + fluid dynamic bearing = PERFECT This IceGALE® fan has a sturdy brass housing, making it a reliable product, and a fluid dynamic bearing that reduces the noise level and thus ensures quiet operation. Automatic START/STOP function Creates a quiet environment and reduces power consumption and heat generation for a more comfortable work/play experience. When the fan is turned off, it goes silent until the PWM duty cycle reaches 21%. Speeds up to 2000 RPM With a speed range from 800 rpm to 2000 rpm, this fan allows you to work at a high level and with as little noise as possible. Two-plane balance Like all IceGALE® fans from Iceberg Thermal, this fan is equipped with two-plane balance to ensure the stability of the fan.