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 : 390W Power Requirements: 220 V/50 Hz ,110V/50Hz ,230V/50Hz Machine Size : 33*23*44cm Net Weight : 10kgs Usage : Home+office+trave