 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. Uses Oxy technology, sending out O3 molecules that seek out and destroy those odors, getting rid of them. Don't use sprays and candles to cover it up.