 Left that clean and fresh scent. Gets rid of the odors, the mold, the viruses in the air. And it does it in a very, very efficient way. Out of the way. Small profile. You plug it in to the outlet. Doesn't take up a bunch of space in your living room or your bedroom or wherever it has to be. You also don't replace filters all the time. That's going to save you a bunch of money.