Comparison of Portabler Units NT-02/ NT-01/ Inogen One G3

Comparison of NT-02/ NT-01/ Inogen One G3
Models	NT-02	Inogen One 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	Pulse flow / Release oxygen every 3 Seconds	Pulse flow	Pulse flow
Low noise	≤58db	≤42db	≤58db
Weight	4.85 Pounds	4.9 Pounds	7.05 Pounds
Intelligent control &display	✅	✅	✅
Timing function	✅	🔲	✅
Charging time	4-8 H	4-5 H	4-8 H
Battery life	3.5 H	4.7 H	3 H
Replaceable battery	✅	✅	🔲
Replaceable battery price	8-cell for $139 16-cell for $219	$407	🔲
External battery charger	Not Needed	Needed(Buy separately)	🔲
Accessories	✅	✅	✅