Devanti Aroma Diffuser 500Ml Essential Oil Ultrasonic Air Humidifier4 IN 1 FUNCTION: With its discreet modern design, our ultrasonic aroma diffuser actually performs four functions in one device: humidifier, purifier, night light and aromatherapy. REVITALISATIN BENEFTS: It uses electronic frequencies to create vibration in water and create a scented aroma to calm and revitalize your body. TIMER AND WIFI CONTROL: You can set the diffuser to work continuously for up to 15 hours by selecting its three timer functions.