First let me say I bought this portable oxygen concentrator because the one that I had been using that I got from the VA died and their supplier told me that it might be another 3 weeks or more to get a new one. The price of this unit is great when compared to other units on the market. It works exactly like the one I got from the VA with a couple of exceptions. The oxygen supplied by the unit is supplied all of the time where the VA unit is intermittent and I have to turn the air flow up to 5 when I am using it if I am active at all. I use a flow rate of 3 at home and this new one I am able to use at 3 because air is constant. The new unit is a little nosier than the one from the VA but I got used to it fairly quickly. I bought an extra battery for my Charm Key unit and they are very easy to change. The Charm key unit will not charge while using it but with 2 batteries everything works out great. The unit includes a home plug in charger and one for my automobile. I just make sure both batteries are completely charged when I leave home and if the one that I am using runs out switching is fast and easy and I can charge the exhausted battery while I am driving. The Charm Key unit only weighs slightly over one pound even when I am carrying the extra battery. The unit from the VA is closer to eight pounds and with the extra battery for that unit it weighs over eight pounds. The Va unit comes with a very nice cover with strap to carry it. The Charm Key unit comes with a small bag with an adjustable strap that has an extra pouch for the extra battery and one for an extra tube. The charm key unit I toss over my shoulder cross body fashion and it is so light that I can't tell I have it on. I love this thing. I have to tell you that The VA actually sent me a new unit quicker than they had told me so I have two complete systems. I will keep them both and use them both for any long trips that I may take assuring me that I will have an oxygen supply at all times. I hope this helps.

It is so much easier to get around with this little, light machine. As compared to my 5 pound machine. The battery seems to be holding up well. I’m trying to talk a good friend into getting one!

I needed an oxygen concentrator that was portable and had a good battery life. This fills the bill exactly. Am excited about how it works and allows me to spend time away from home comfortably.

New 3 Liters Continuous Flow 0.6KG 4 Hour Battery Portable Oxygen Concentrator - C-YS10-B

This is the perfect weight for walking around.