From FB SOS Global indians group  MY EXPERIENCE WITH BUYING & SHIPPING AN OXYGEN CONCENTRATOR TO INDIA What is an Oxygen concentrator? It is a device that converts the air into an enriched output of oxygen gas. It is an alternative to oxygen cylinders. Oxygen cylinders empty out quickly and need to be refilled. An OC relies on electricity or battery to run and utilizes the air around us. Which model should you buy? OCs can be of two types - pulse/portable (uses battery) or