Allin Exporters 2.4 -Liter Cool Mist Ultrasonic Humidifier effectively increases room humidity levels. The moisture- and energy-efficient design make it the perfect fit for any room in the house or office space. This is the Listing of Humidifier, Please Don't use any of the Essential OR Aroma Oil in the humidifier as this is a perfect Humidifier, not a Diffuser, We don't recommend use of any of the essential oils in our Humidifier. If you want the 2-in-1 feature of an Ultrasonic Diffuser and humidifier, please buy our 2-in-1 Ultrasonic diffuser and Humidifier. You can search on Amazon for Ultrasonic Diffuser. Here is Why Most humidifiers run continuously. There is no timer setting to allow the body the necessary time to absorb the oils. Essential oils, especially citrus oils, break down plastic. Humidifiers are not constructed to hold up to essential oil usage. Diffusers are specifically designed to handle essential oils. Humidifiers are made to handle water. Even its Ultrasonic Units is designed to Handel Only water, any of the Oil increase the Thickness of the water which can Damage the Ultrasonic Mechanism of Humidifier Humidifiers are not ionic nebulisers. Essential or Diffuser Oils are not recommended to use in Ultrasonic Humidifier as these are made of plastic that may react with Diffuser Oils (like Citrus oils) to diffuse harmful & reactive mist. If you're looking to have the power of humidification and aroma diffuser in one unit, try our range of 2-in-1 Ultrasonic Aroma Diffusers that are made of BPA-free plastic and are safe to use for enjoying the aroma and maintaining humidity in the interiors at the same time.That's Why Ultrasonic Diffusers are Bit Expensive Humidifiers can disperse essential oils into the air, but a diffuser will nebulize them into minuscule particles that can be more readily inhaled and absorbed.