Place of Origin:China Instrument classification:Class I, Class II Medical Grade Warranty:2 years After-sale Service:Online technical support Product Name:portable oxygen concentrator Oxygen density : 93%, 3% across all flow rates Compressor life:15,000hours Power Consumption : 300-350W Power Requirements : 220 V/50 Hz ,110V/50Hz ,230V/50Hz Machine Size : 348*280*510mm Net Weight : 16kgs Usage : hospital