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Instructions for Use: 1. Hold the ends of the straps with both hands. Pull the straps fully to ensure the mask completely covers your nose and mouth, and fasten the straps at the back of your neck to secure the mask and face to an airtight seal. 2. Pull the ends of the straps again to tighten them further. 3. Before use, check that the mask is tightly sealed. Cover the air inlet of the filter box with your palms. Take a gentle breath and hold it for 5-10 seconds. The result is good. If there is air leakage during detection, readjust the mask and re-tighten the elastic straps to eliminate leakage and re-check the airtightness until it meets the requirements. 4. During use, if the user experiences increased odor or breathing resistance, the filter box's lifespan will be exhausted. Please replace the filter box or cotton filter immediately. Special Precautions for Users: 1. Please do not use this mask when the oxygen concentration is below 18%. 2. Please do not use in the following cases: Unknown hazardous substances. The concentration of hazardous substances reaches a level that is immediately dangerous to life and health. When you smell or taste hazardous substances. 3. Do not modify this mask. 4. Pre-use training should be conducted by a qualified person before use. 5. When not in use, Keep masks away from contaminants and keep them sealed.