Nine dual-layer rigid blades generate more powerful airflow, air pressure & decrease wind shear noise. Innovative COUGAR diversion claws to provide focused airflow & reduce noisy air turbulence. Reduce the vibrations efficiently & silent operation. Red LED with transparent red blade generates energetic visual effect. HB runs more smoothly with no friction, make it quietly & durability. Rubber fixed pins also reduces vibrations (fan run more quietly) and tool-less makes it easy to mount, with no tools required.