Heaven fresh xj200 ionic air purifier this negative ion generated utilizes advance corona discharge technology to create safer healthier air for babies nurserys up to 28msup2300ftsup2 this silent tabletop unit features 17 stainless steal ionic pins removeable dust collection plates highlow setting and runs on just 6 watts negative ions produced by the hf 200 ionic air purifier purifies the air by attaching themselves to positive ions thus making them too heavy to remain in the air