... 3.treatment of coryza, pharyngitis,bronchitis, etc. 402AI Ultrasonic Nebulizer Descriptions: The ultrasonic nebulizer can nebulize the liquid medication into tiny mist ... equipped with a package for outside use) Principal technical data: Ultrasonic frequency: 1.7MHz ± 10%Continuous working time: ≥4h Consumption ... :350mLMax nebulizing rate: ≥ 4mL/minVoltage: AC220V±10%Picture 402AI Ultrasonic Nebulizer