Technique Parameter Oxygen flow rate .. 1L-5L Oxygen concentration .. 93% + 3% Rated voltage / Power .. AC220+V 22V ,50Hz + 1Hz Material .. Plastic Oxygen concentration .. 0.5-3L/min + 90% Flow fluctuation .. 0.7L/min Atomization amount .. + 0.2ml/min environment temperature .. 5-40 humidity range .. 80% Atmospheric pressure range .86kpa -- 106kpa Size .. L448*W245*H492 Weight .. 14.5g 1. Headset type components (optional) 2. Nasal tube assembly (optional) 3. Atomizer assembly