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Features:Adjustable oxy-gen conce-ntration: supply continous flow 1-6L/min adjustable, 30%-90%,(1L: 90%±3 2L: 50%±3 6L: 30%±3 )Portable and lightweight: only 5.2kg, Could work plug-in home power supply(AC 110V )for continuous working 24 hours a day if you do not set timer.Intelligent Control: IMD be..