... , by pull back and down to spray mist, by press down to spray oxygen. Adjust the end knob of the sprayer to adjust the mist volume, Left is ... on the nose to do oxygen scent. After it, please apply mask for skin care.If less of oxygen, how is the people going ... ?Less oxygen at brain——Swirl, headache, tingle, nausea, nervous, lose heart, consciousness and to be death ...