Mabis Mist II Handheld Ultrasonic Nebulizer has been designed to offer compact, portable and lightweight (under 1 lb.) convenience while receiving inhalation treatments. This unit requires ordinary tap or distilled water and your physician-prescribed medication to create an effective high frequency mist. Treatments can be administered discreetly thanks to advanced ultrasonic technology making your Nebulizer virtually silent during operation. An easy airflow volume control with triple settings allows full control of treatment levels as recommended by your physician and/or respiratory therapist. This unit operates on standard AC power or battery pack. Together with your physician and/or respiratory therapist, you can feel comfortable and confident knowing that you are obtaining the most effective inhalation treatments for your respiratory condition. Five modes of medication delivery includes mouthpiece, extension tube with mouthpiece, extension tube with adult mask, extension tube with child mask and nasal piece.