1.Unfold the inner side of the mask with both hands, so that the nose clip is above the mask
2.Press with both hands, index fingers from both side of the middle to adjust the iron piece above the mask
3. Pull the elastic belt to the back of the ear and adjust the mask and elastic belt to feel comfortable
4. Cover the mask with your hands & breath, if there is gas leaking out, please adjust the mask.
1. This Mask not suitable for use in hypoxic environment(when the oxygen concentration is below 19.5%)
2. It is not suitable to use the mask when the concentration of pollutants is too high to endanger life or health
3. This Mask is not for protection against harmful gases or vapors
4. Replace With a new one if the mask is contaminated , damaged or has increased respiratory resistance.