1,Monitor parameter: Tidal volume, breath frequency, MV 2,Gauge: 2 units, one N2O, one O2 3,Circle absorber: Compact circle ... .25 ~ 0.65MpaN2O: 0.25~ 0.65MpaGauge: 2 units, one N2O, one O2 v the anesthesia equipmet supplier ARIES 2800 with CE marked