Usage method:

1. Take out the mask, white face inward, blue face outward;
2. Align the face mask with the mouth and nose, with nose clip upward, and press the nose clip gently to make it fit with nose;
3. Hang the ear belt on the ear (or tie it to the head), and adjust the ear belt on the ear (or tie it to the head), and adjust the ear belt/tie to a comfortable state;
4. Adjust the wearing of the face mask to cover only the lower jaw of the nose, so as to obtain better protective effect.