... low noise medical treatment level oxygen purity The smartly designed 1L POC redefines the concept of portable oxygen concentrators. It provides ... needs; stationary,portable and travel .Flow and be adjust between 1L to 5L,and the purity is able to reach 90 ... (mm)Flow1L-5LPower Consumption70WVoltage/Frequency220-240V/50Hz or 115V/60HzWeih5Kg 1L PORTABLE OXYGEN CONCENTRATOR