Lighter and smaller in dimensions, the world's smallest portable oxygen concentrator, with the ability to provide oxygen only during inhalation from 1 to 3 Lt/min, which is equivalent to a continuous flow of 90% purity. It offers autonomy up to 3½ hours (flow 1Lt/min) using the internal lithium battery, while additional accessories include a belt-type battery increasing the device's autonomy by an additional 10 hours (flow 1Lt/min). The uniqueness of Freestyle concentrators is due to the advanced UltraSense™ technology, which ensures quick and reliable oxygen delivery during inhalation when the lungs receive the highest pressure. UltraSense™ technology also ensures maximum possible delivery even when using an extension tube up to 7.60m.