How to put on a breathing mask correctly?
Use of oxygen mask - mouthpiece
Remove the plastic cap from the plastic breathing mask.
Remove the plastic inhalation mask from the bottle.
Put the inhalation mask on the valve on top of the bottle.
Attach the mask with the bottle over the nose and mouth (narrower cutout in the mask to the nose).
Press the button and simultaneously take a deep breath through your nose for 3 seconds.