DEDAKJ Home Oxygen Devicer, Portable Oxygen Concentrator, 30-90%, High Purity, 1-8 L/Min Flow Rate, Adjustable (Q1W)Oxygen release: With an oxygen purity of more than 30 90% and an adjustable flow rate of 1 8 L min, you can enjoy clean air at home. Delivers an even flow of up to 90% pure oxygen from normal air. Multi layer filter: The oxygen system of this product has a coarse dust filter and a filter for fine dust particles and a triple bacterial filter treatment for entering air. Finally, after filtering, the oxygen is fresh and clean, and the filter with two