I got this air purifier, having no clue the size or how well it would work. Well, I am so thankful I did! It is about 8-9 inches in height and sits on my nightstand. I love that it has 3 settings for the times, so it shuts off automatically, which is 2,4, and 8 hours also the night light had 2 settings for brightness or you can have it turned off. The sound it makes very soothing, and you have different ratting for that . It also has on 3 side night lights, so it triples as a purifier, noise soother and a nightlight. I noticed a huge difference using this with my allergies to dust and pet dander haibg 3 fur kids. I am not congested in the morning anymore, and the sound absolutely makes me sleep a million times better, and I no longer wake up in the middle of the night. I am actually going to buy another for my office because of how well it works.