VARON 1-5L/min Pulse Flow Portable Oxygen Concentrator NT-02+ An Extra Extended Battery

Accessories For NT-02Replaceable 8-cell Battery/ 16-cell BatteryExtra ChargerExtra Filters (10 pcs/pack)Extra Versatile Bag Extra Car Power Inverter   Three Different Charging OptionsAC Power Supply- Home/Hotel/ Office/ Indoor UseDC Power Supply-Use in the CarExtra Battery- Outdoor Use    Comparison of NT-02/G3/NT-01(Mobile users, please swipe the chart below left and right to view the comparison details) Model &Features Model NT-02 G3 NT-01 Price $ 999   $ 2495  $ 549 Oxygen Concentration  93%±3  90% - 3% /+ 6%  93%±3% Adjustable Flow  1-5L  1-5L   1-5L Operation Mode  Dual oxygen mode   Pulse flow  Pulse flow Weight 4.85 Pounds  4.9 Pounds  7.05 Pounds Timing Function  √  □ √  Charging Time 4-8 H  4-5 H  4-8 H   Battery Life 3.5H（8-Cell） 6H (16-Cell） 4.7H 3H（8-Cell） Replaceable Battery  External  External Internal Replaceable Battery Price 8-cell batte