The product is foldable and can be placed in a bag, making it convenient to hang on a bag. It cleverly integrates a filter, whistle, and fire mask. When you inhale, you get purified air through the filter. The whistle device inside the mouth produces a sharp sound when you exhale, which helps rescuers quickly locate the user. When held in the mouth, it has a special fixing method that prevents it from falling off, greatly ensuring the user’s safety and the functionality of the product. The product also adopts a new type of ear clip wearing method, which reduces the time wasted during escape.