1. Do not use the face mask earloop 3ply if the package is damaged;
2. Discard the device after use. The device is meant for one-time use only;
3. The storage areas need to be well ventilated and free from corrosive gases;
4. It should be well equipped with fire and rat prevention, moisture, and pest control facilities and do not store at extreme temperatures;
5. Do not use it if it is over its expiration date.