Carrying on patented Golf dimple fan blade design, Golf fan II gives you something more than just quietness. Adopting innovation Japanese premier long life DURO bearing, adjustable fan speed PWM function and compatible with blue LED lights, quiet matters, performance and energy saving are not to second. Sophisticated DURO Bearing, brings up life expectancy of 60,000 hours in 40 degree and no oil leaking issue like conventional fan bearings, increases fan efficiency and also reduces current consumption. PWM function from 300~ 2500rpm (varies per fan sizes), rotating at low speed minimizing with low noise level to high speed powerful performance, fits to user’s needs. Unique Golf dimple blade design unifying with DURO bearing reduces noise level down to 10dBA, not what to be heard.