Lepa BOL.QUIET Tri-Speed Cooling Fan LP-BOL12R Obsidian LEPA modular frame with LEPA logo halo ring design to increase more airflow S-blade with winglet design to improve cooling efficiency Patented Barometric Oilless (BOL) Bearing for long lifespan and silent spinning Extra 7V / 5V adapter provide 3 speed modes for maximum flexibility LEPA modular frame with LEPA logo halo ring design to increase more airflow S-blade with winglet design to improve cooling efficiency Patented Barometric Oilless (BOL) Bearing for long lifespan and silent spinning Extra 7V / 5V adapter provide 3 speed modes for maximum flexibility Rubber screws to reduce vibration and keep silent operation Removable fan blades for convenient cleaning