... /min Air 0.2~12L/minFlow djustment:O2+NO or O2+AirO2 flush:35~75L/minBuild-in Safety ... 25% percentage of oxygen Oxygen deficiency alarm when O2≤0.2Mpa, audible alarm occurs and lasts for ... power fails, the power switch over to internal battery which will run the machine for approximately four hoursVaporizer ... alarm for O2 supply low, Paw low, Paw high,MV low MV high, Apnea, O2% low,O2% high, battery low, ...