The EEBD are only used for escape from a compartment that has a hazardous atmosphere to provide personnel breathing protection .Not to be used for fighting fire, entering oxygen deficient voids or tanks, or worn by fire fighters 2. There is a pressure gauge on the cylinder to indicate the cylinder pressure .The cylinder pressure of EEBD is not indicated by a pressure gauge during storaging.3. The hood is a flame resistant head cover which completely covers the head, neck, and may cover portions of the shoulders, there is a clear window on it. 4. Easy to use, open the cylinder valve and put the hood on head when use