Professional oxygen production and quiet enjoyment home oxygen therapy 3L medical oxygen concentrator Y317W intelligent voice model 90%~93% high oxygen concentration 43.6 decibels low noise quiet oxygen production atomization one machine dual use intelligent voice alarm reminder specially designed for people with mild to moderate hypoxia Designed with medical quality, suitable for a wide range of people: people with respiratory system diseases, people with cardiovascular and cerebrovascular diseases, and people with three highs