American Red Cross Rapid Response canister is an all-natural respiratory support product for aerobic recovery and performance. Simple and safe to use, the Portable Oxygen Canister provides supplemental oxygen wherever you need it. It is 98% pure and concentrated supplemental oxygen which is nearly 5 times the amount of oxygen we breathe in the air alone, which is only 21% at sea level. Supplemental oxygen has always benefitted so many people for so many different reasons. From altitude acclimation to athletes to anyone looking for a way to catch their breath. Convenient, easy-to-use, and portable, the canister is safe with no chemicals, propellants, or side effects and available to everyone without a prescription. It is an excellent choice for first responders, outdoor enthusiasts, home/business first aid stations and people who live in areas with poor air quality. People with trouble catching their breath love the accessibility as well.