High Pressure 4-6bar Large Flow 93% Oxygen Purity Generator Special Features only provided by AngelBiss Technology 1. The world's NO. 1 Oxygen Output Purity Fluctuation rate controlled within 0.1%. 2. Automatic heavy humidity remove molecular sieve 3. Independent Oxygen outlet & nebulizer outlet system 4. Child Lock settings 5. 3 years warranty or 18000hours lifetime 6. Durable use for environment areas at high temperature (45C), high altitude (4500m).