This thing is great. It's a little bit bigger than I imagined probably about 9 or 10" by 9 or 10" squared.. It can take an entire bottle of diffuser oil so you won't have to refill it very often at all. Just put the oil in and you're good to go.If you like your house smelling wonderful all the time that hate constantly happened by refills for the little air freshener things layer freshner things or are tired of having diffusers sitting all around your house then this thing is awesome!! I put this in one corner of my living room and it literally fills my entire house with! If the door is open then the smell gets in there in my whole house smells beautiful all the time nowI love that you can put an entire bottle of essential oil in so you almost never need to refill it. When the bottle is empty just pop it out and pop in a new 1. It almost seems like it's purifying the air too because there's no heavy hanging odor just a light beautiful clean scent dispersed evenly through my houseSuper easy to use and set up and requires very little attention or maintenance whatsoever once you get it going. Just plug it in and let it do its jobExtremely satisfied with this and super happy I ordered it. I'll also save a ton of money on air fresheners. A bottle of oil last quite a while from what I've seen so far and is much cheaper than refilling those little timed air freshener things and the smell definitely last longer! I would recommend this for any home, office or business