I'm at loss on how to change the filter… I'm at loss on how to change the filter cotton in my NT-02, but after contact their customer service team, they promptly sent me a how-to video. They were both friendly and professional

Fast Delivery I couldn't be happier with my purchase during the promotional event! Not only was the price of the oxygen concentrator remarkably affordable, but it also came with all the necessary accessories. Just five days later, I received my much-anticipated machine. It's working flawlessly and has truly satisfied all my needs. Fantastic service!

Order oxygen concentrator December 23… Order oxygen concentrator December 23 2021 received following week damaged. Contacted ttlife several times and sent pictures each time as requested. Now end of March 2022 and told replacement time is expired. I am screwed by another Chinese company.. never order directly from any foreign company. I will always go thru Amazon they have instant refund or replacement. TTLife sicks big time.

NT-02 Works Great NT-02 Works Great. Ordered mine and it arrived in five days flat. It's keeping my O2 levels at a solid 96%, making my breathing much easier. The replaceable batteries are a plus, giving me peace of mind for doctor visits and meetups with friends. Recommend it.

I was impressed with the customer… I was impressed with the customer service team, they patiently asked me what I wanted and I told them it was for my mom who lives in Florida and has emphysema. Then they recommended a suitable machine to me and provided a good discount to ease my burden. Thank you for their help.