• Oxygen output: More than 30-93% oxygen purity, adjustable 1-7L/min, provides a constant flow of up to 93%±3% pure oxygen. • Widely used: Ideal for respiratory diseases, cardiovascular conditions, plateau hypoxia, middle-aged and elderly people, pregnant women, students, and people in confined spaces. • Multi-layer filter: Includes coarse dust filter, fine filter, and three bacterial filtration treatments, ensuring fresh and clean oxygen. • Standard accessories: Includes generator, earphone-type inhalation device, nasal suction, 3-meter oxygen tube, remote control, power cable, user manual, and filter.