Existing oxygen masks can only help one life each. When a fire occurs, rescuers commit their lives to save the survivors who are not able to escape. Most of the time, the rescuers will give their oxygen masks to the survivors who have already been exposed to toxic gases for a long time. In the process, the rescuers may suffocate. The concept of the Sharing Oxygen Mask is to provide an auxiliary mask on top of the main mask. This will ensure oxygen supply for both the rescuer and the survivor to help both of them escape the fire safely.