This diffuser is great for use in any large or extra-large room due to its 600ml. size. Operating for 15 hours continuously means you can keep your living room or master bedroom in the environment and smooth fragrance you would like, all day. The ultrasonic technology brings a misty spray along with any essential oil’s gentle fragrance, keeping the air moist while operating silently without taking anything away from the peaceful atmosphere you have created. The wood design gives the diffuser an earthy feel while still blending in with the décor of any home.