I love the look of the little ufo - wish it came with instructions. I figure you need to drip essential oil on the wooden tray in the center and it will soak in. Not super strong scent, as far as diffusers go, and you'll have to pick a scent category that blends well, since there's no way to clean out an existing scent for a new one. Definitely adorable, though I would speculate a little overpriced for the efficacy of the product. Great small decoration. Base of light beam is about 1" diameter, the UFO disk is about 4.5" diameter, and stands about 5.5" high. It's fun to shine a light through a grid underneath to light up the beam, and if you have a little picture that you can place on the bottom it can look like it's being beamed up, which is fun, too.