cpr face protect mask one-way valve case kit for first aid training teaching msu99

cpr face protect mask one-way valve case kit for first aid training teaching msu99 description: how to use it: when the patient will be sick to maintain respiratory ventilation unobstructed, the mouth of the middle of the breathing film into the wounded mouth, from the other side to the wounded, the plastic mouth with a one-way valve will prevent the casualty exhaled gas into the mouth of rescue workers. it's a good tool for artificial respiration. this baby is one of the protective supp...