I really love this TrueAir Room Odor Eliminator. It is very effective at removing odors and leaving the room smelling very fresh. It has 3 filters and a cartridge with the scent "green meadow".  When you take it out of the box, you just flip it over and remove the bottom ( no tools required) and remove the plastic from the filters and cartridge & place them back in. Put the cover back on, flip it over, plug in and turn on. Very easy to get going. Pretty much no set-up. This unit does not cover up odor, it actually eliminates it through these 3 filters. The scent is subtle, and very pleasant. It has an off/low/high speed. And one of my favorite things is how portable it is to bring room to room. My house gets unwanted odors from cooking, my cat and just living in the city. I would highly recommend this!