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 Requirement s:220 V/50 Hz ,110V/50Hz ,230V/50Hz Machine Size : 348*280*510mm Net Weight:16kgs Usage:Hospital