1) Produces anions which eliminates micro dust, smoke, 99% of bacteria and air-borne germs making it the perfect choice for a healthier environment2) Helps your body produce serotonin, which alleviates depression and relieves stress3) We are the only store that sells this light. NO ONE else, especially online sellers do not provide it4) Dimensions : Dia 140mm / Cut Hole Opening : 115mm / Depth : 80mm