The heaven fresh hf710 utilises high frequency vibration technology to create a fine mist that immediately evaporates into the room creating a comfortable living and sleeping enviroment your own essential oils can be added to the aroma box to increase the therapeutic capabilities features a large capacity water tank 6l16 gallons and refills with regular tap water the hf710 can quickly humidify a room up to 60 msup2 and using its advanced digital technology can produce either cold or wa