Power Consumption : 48W Compressor gas displacement:> 11L/min AC power : 100-240 VAC 50/60 Hz DC power : 12VDC Battery : 14.8V, 6Ah Battery working hours : 2 hours/level 5 Battery Charging time : 4 hours Battery Life : 300 times Rates equivalent oxygen flow: 1, 2, 3. In, 5 L/min [Adjustable] Flow Settings and Pulse Volumes: 1—167ml/min 2—333 ml/min 3—500ml/min 4—667ml/min 5—833ml/min Oxygen Concentration : 93±3% Outlet Pressure : 50-120 kPa Sound Level dB[A] : < 48 Working Altitude Oxygen flow < 3L/min, < Altitude: 3500 meters Oxygen flow 4-5L/mln. < AltItude: 1000 meters Application : it is suitable for peeple who enjoy travel Batteries used in this machine are approved by FAA