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5 Liter Silent Medical Oxygen Concentrator LCD Touch Panel Timer Hour Meter Low Noise Household Portable Generator Machine Home Care Elderly Respiratory Therapy. Measured <42 dB(A) at one metre: quiet enough for continuous overnight bedroom operation. Double-layer acoustic foam with suspended compressor mounting and re-routed airflow path. LCD touch panel with readable cumulative hour meter, simplifying warranty assessment and after-sales service.