... carbon deodorization strainer ,remove formaldehyde ,ammonia gas and acetic acid in air which harmful gas and foreign odor.3. nanometer activity Ionizer ... foreign odor automatic, clean dust, dispel foreign odor and harmful gas, double sterilizing, release activity ion and humidification.all-in-one ... -G-B38 have humidify function ,keep humidification in the room Portable home air purifier