... get pure oxygen for medical use.Technical Parameter: Part NoWorking Voltage(V)Rated Power(W)Oxygen Concentration(%)Oxygen Flow(l/min ... as material, need not any other asscssories,. lower cost;2. Adjustable oxygen flow, any time you can get pure and endless ... convenient for use.3. Simply for operate, stable performance, low noise.4. Use low Pressure Control system, safe and reliable.5. The device ...