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Usage:Home Self-testFunction: Oxygen monitorDisplay:LCD Digital DisplayWeight:50gBattery:2*AAA Alkaline BatteryMaterial:ABS PlasticFeature:High SensitivityQuality Certification:FDAPower Source:ElectricWarranty:1 YEARAfter-sale Service:NONEPower Supply Mode:Removable BatteryMaterial:PlasticShelf Life:3 yearsInstrument classification:Class ISafety standard:NonePlace of Origin:CNGUABrand Name:Kantravel