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