PWM-FUNCTION PWM stands for Pulse Width Modulation. The 4-Pin connector allows the mainboard to control the fan speed from 800-1500RPM. HIGH-VORTEX-AIRFLOW WITH TURBINE BLADE & FRAME UNIQUE DESIGN Optimum airflow, air pressure & extremely silent performance DIVERSION GROOVE BLADE DESIGN Innovative blade design focus air flow & optimum cooling efficiency ANTI-VIBRATION PAD DESIGN Reduce the vibrations efficiently & silent operation AERO-DYNAMICAL DESIGN Air-inlet with optimal aero-dynamical design reducing noisy air turbulences HYDRO-DYNAMIC-BEARING TECHNOLOGY HDB runs more smoothly with no friction, make it quietly & durability(MTBF300,000hrs) TOOL-LESS FIXED PINS Rubber fixed pins also reduces vibrations (fan run more quietly) and Tool-less makes it easy to mount, with no tools required
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