The Puressentiel ultrasonic diffuser Topo atomises with a light water mist and can be used with essential oils. If the diffuser is only used to humidify the room and clear the airways, essential oils should not be used with it. The essential oils are mainly used to create a feeling of well-being in the room, in case of bad smells, dry air or in stressful situations. The Puressentiel ultrasonic diffuser Topo is easy to use and can be changed into 4 different colours.