Driven by ultrasonic waves , the essential oils can combine competely with water.and release large numbers of anions into at Rated voltage: 5VDCRated power: 0.5W, PTC heater Applicable place: rooms(bedroom, living room, yoga room), hotels,hospitals, SPA circumstances. office, corridor, and etc. Applicable space: 30 square meters Driven by ultrasonic waves at a frequency of 1, 700, 000 times per ...