Aroma Diffuser runs for one hour, three hours or six hours. love the new style of wood look great , the nice selection of changing colours add the smoothing effects of the mist , no need for anymore nasty cans or candles this is just pure and simple water vapour mixed with a hint of oil then your home is smelling great , unlike using say a candle that will have all the dangers of wax spilling all over the place or catching fire this is so pure and simple to use water mixed with a nice section of Aroma oil PLUS the Essential Oil Diffuser is also ECO FRIENDLY to me this is the way forward now not giving of any nasty smells , just pure water vapour mist mixed with Aroma oil smelling great thank you for a top quality product