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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 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
Air-inlet with optimal aero-dynamical design reducing noisy air turbulences
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