Unit has a distinct flashing blue light that stays on all the time. The running noise could be a called a "white noise”. I kept the unit because of the size (table top) and that it did it’s job; it purified the air. Used in households with cats and dogs which normally cause allergic reactions, it did make life better - than not having the one. Seller only sent me statements about the filter when asked if I could somehow turn off the blue light.
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