Jon W.
Tried unit for two nights and it ran as…
Tried unit for two nights and it ran as expected.

TTLIFE from American Medical Sales has over 15 years of oxygen therapy experience and we offer the highest quality brands of Portable Oxygen Concentrators, Home Oxygen Concentrators.
TTLIFE (oxygenconcentrator.shop) has 267 customer reviews on Five Star Index, with an average rating of 3.7 out of 5.
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267 approved reviews, newest moderated first
Jon W.
Tried unit for two nights and it ran as expected.
Judy A.
I got the 2 nebulizer package at a good price. It's much better than the previous brand which broke down after only a few months. Can I get a refund?
Michelle F.
Do not buy from this company. I bought a concentrator for my father who passed away before it arrived. I have tried to get a refund as it was unopened and this was a scam. It took two weeks of emailing back and forth to get an address. they made me jump through hoops sending photos of the unopened boxes. When they finally gave me an address in Maine, I was out of town for work three days and they said i had to send pics of the mailing labels and send within 48 hours or they wouldn’t accept the return. I explained I was out of town at that point - it was a Thursday- and would mail it Monday which I did. I sent the required photos of mailing labels. The next step was I had to let them know when it was delivered. So I tracked them and emailed them when they were delivered. I have never gotten another response or refund. Total scam. Not a real company. My mom is in memory care and needs that money. Do not buy from this “company” site!
Response from TTLIFEDec 12, 2025
Hi there. We are truly sorry for your loss, and we sincerely hope you can find comfort during this difficult time. Losing a loved one is emotionally overwhelming, and we completely understand that such moments can make any extra process feel even harder to deal with. That said, we would also like to clarify our side, respectfully and transparently. TTLife is a legitimate company, and like all medical-related equipment brands, we are required to follow a standard return and verification process — including confirming the product is unopened and unused, and ensuring the package is safely returned to the correct warehouse. These steps are not meant to cause frustration, but to comply with safety regulations and protect both our customers and our company. Throughout the communication, our team responded to your messages, provided the return address, and confirmed the product could be refunded after it was received back at our warehouse. We truly understand that dealing with logistics during a time of grief can feel overwhelming, and we empathize with your frustration. Even so, we never refused your request — your return has been accepted and your refund has been processed (or is currently being processed according to bank timelines). We genuinely wish things had happened under different circumstances, and we’re sorry that the situation added stress during an already painful moment. While emotions can understandably run high in times of loss, we hope you can also understand that we have policies we must follow to ensure every return is handled properly. Once again, our condolences to you and your family. If there is anything further we can help with, we are here for you. Best Regards. TTLife Team
Lorraine J.
I was impressed with the customer service. I messed up my address, but they fixed it immediately before it shipped. My seren5 package still arrived in five days. Everything went perfectly smoothly.
Walt J.
The unit is fine and other than being a little noisy it works well. The communication and shipping were terrible. They only used a single tracking number for about 5 packages and of course when the first one arrived it reflected that they ALL had arrived!! Most of the packages came from China or somewhere and took forever for them all to get here… Made me a little nervous as I hadn’t done business with them before!
Cornelia D.
Got my NT-4 in only three days, and it works great. I'm happy with the purchase.
Danny
I have not received my product yet. Been looking for it over a month.
Response from TTLIFENov 19, 2025
We’re very sorry to hear that you still haven’t received your product. This is definitely not the experience we want for our customers. Could you please share your order number with us? Once we have it, we’ll immediately check the shipping status and make sure your item is delivered as soon as possible. Thank you for your patience, we’re here to help.
Ernest C.
The oxygen concentrator is a great machine. Works quietly, great price and great customer service