Ultrasonic Air Freshener High frequency ultrasonic diffuse liquid into small particles,Creating a relaxing atmosphe Ultrasonic Humidifier Aroma DiffuserHigh frequency ultrasonic diffuse liquid into small particles, ... ,Approval PSE,CE,GS,UL,KC Ultrasonic Humidifer Aroma Diffuser1.It utilizes a high frequency 1,700,000 times per ... 4392pcs/20'gp, 8640pcs/40'gp, 10880pcs/40'hq Ultrasonic Air Freshener