When a fire occurs, smoke suffocation is the highest fatality rate of "invisible killer." This product is suitable for medium-term fire escape, in the initial fire can not be successfully extinguished, to bring more passive waiting for rescue personnel to survive. When the oxygen content in the air is low and 18%, the common filtering respirators on the market cannot provide protection for the respiratory health of the escaped personnel due to their limited functions. In contrast to this, a portable oxygen cylinder is added on the basis of filtering protection to extend the oxygen inhalation time to maintain a healthy breathing environment.

I hope to get your advice if there are any shortcomings ~