I bought this to go in my guest room and it is perfect! It hold 300 ml of water and lasts all night long on full on. I like that it has several options such as full on, 30 seconds on, 2 hr timer, and 4 hr timer; this adds to flexibility in different situations. It looks nice in the room and the lights add a nice ambience. You can let the lights cycle, you can choose your favorite color, or you can leave the light off. You can even adjust the intensity of the light. It has a strong steady mist that infuses the room with scent.