Display screen 7″ Colorful TFT LCD screen Gas source O2, AIR Oxygen concentration Adjusting range: 21% – 100%; Monitoring range: 15% – 100% CPAP Adjusting range: 0 cmH2O – 15 cmH2O Monitoring range: 0 cmH2O – 60 cmH2O Continuous flow Adjusting range: 2 L/min – 20 L/min; Monitoring range: 2 L/min – 20 L/min Manual Ventilation Output flow: 20 L/min ± 5 L/min Air compressor Continuous output flow: ≥ 25 L/min; Peak output flow: ≥ 120 L/min Oscillographs P – T (pressure – time) Alarm and protection 10 kinds of alarm and protection Voltage f1u0n0c t-i o2n4s0 V Power frequency 50 Hz ± 1 Hz