1. Filters are not washable, It is recommended to use 1 filter for 3-7 days. If you are in an environment with severe air pollution, it is recommended that you replace it every 3 days.
2. If the filter is contaminated with foreign objects, oil stains, etc., please replace it in time.
3. If you have trouble breathing, it is not appropriate to use a mask.
4. Masks are not recommended when the air is thin or when sleeping.
5. This product is not suitable for children under 8 years old.