Technical data of thiswaterair purifier: 1) ULPAfilter removes dust and pollen efficiently. The particles purifying rate is more than 99.9%. 2) Charcoal filter can efficiently decompose the harmful chemical gases, like methanal and benzene. 3) The ozone density is about 0.05PPM, efficiently removes the harmful gas, smell and bacteria. 4) The negative ion density is more than 5000000 pcs/cm³, the effect of removing the smoke and dust is evident. On the other hand, the solid fragrance in air purifier sends out fragrance. 5) Air freshener in the air purifier can make the air fragrant. . Function:With Sumsung chips which can set on automatic timers, it works 20 minutes and stop 40 minutes, and then auto replay. Display: Yellow LCD display