Portable Oxygen Concentrator KSM-5  Specifications Flow Settings Oxygen Concentrations Outlet Pressure Anion function to purifier the surrounding air Power Consumption Use at home/in the car/for travel Relative Humidity Storage temperature Operational Temperature China First POC with continuous Flow ≤ 40 dB (nominal) at flat table, ≤45dB when travelling Sound Level Battery Dimensions Battery Weight Battery Duration At least 1.5 hours at any flow, extra battery is optional. Approximately 4 to 5 hours Battery Charge Time Alarm type No power, no flow, low battery, Depleted battery, wrong battery, s