Quiet, doesn’t take up a lot of space! I keep it in bedroom on nightstand. Bought the bigger one with the lights and diffuser for living room. I will say I have used other products in the past and I regret it I ended up stopping using it and buying purenrichment because theirs is most powerful. Least one to get moldy and love the lighting in all of them. Plus of course what it’s most useful for keeping the air quality for your breathing much more applicable!!! You wont be disappointed!