The Airsep Focus is a major breakthrough in portable oxygen technology. The world’s smallest and lightest portable oxygen concentrator weighs in at 0.8kg and is the first pocket-sized concentrator ever made! This breakthrough in portable oxygen technology weighs 0.8kg and is 6.5 inches long. It supplies 2lpm on a pulse-on-demand setting, and can supply between 3 to 6.5 hours’ oxygen with its standard battery supply. This time can be increased with extra batteries.