[Miriam Fournet]

Hi John, I have been using the Inogen One now for about a year. I chose it because of the size, weight and diversity of charging. It weighs a little over 3 lbs, can be worn over the shoulder and can be charged with electricity and/or a car charger. It is a pulse condensor and I had no trouble switching from the constant flow at home to the pulse for travel. It is quiet and on a level 2 I get about 3 hours of constant use out of it. It takes about 4 hours to charge up on electricity. I place it often in a backpack when traveling. Even though it is a condensor you will need to inform the airline in advance that you will be traveling with it. Good luck with your search. Hope I have helped. Miriam