Self-contained breathing apparatus is an open-circuit positive pressure self-contained breathing respirator. It is easy to operate and mainly used firefighting,chemical industry,ships,petroleum,laboratories etc. It provides fresh air for the firefighters or other emergency rescuer to breathe and work in oxygen-deficient atomospher or toxic environment. This SCBA breathing apparatus has the broad version,bright full face mask.The cylinder is light to carry and of high and steady performance.