1. Oxygen concentration is up to standard (93%±3%) in 24 hours uninterrupted working condition;
2. Long-term oxygen concentration stability and reliable long-term operation, oxygen concentration decay is less than 8% during the life cycle;
3. It has a non-changeable cumulative timing function to facilitate the provision of regular maintenance services;
4. Changable cumulative timing function, which facilitates the provision of regular maintenance services;
4. Provision of professional oxygen therapy and professional regular maintenance services