Very good company Very good company. I highly recommend the Varon machine. Quiet and I only have to use setting 3 to get my oxy level up Don't worry about negative reviews as they are inspired by competitors. DB LAWS MILFORD

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

model NT-05 I recently purchased the NT-05, and it works for me. Its compact and lightweight design makes it incredibly easy to carry, especially when I'm out walking my dog. It's a significant improvement over the bulky machines I've used before, offering convenience without any fatigue. Highly recommend for those seeking a portable solution!

I love the flexibility my lightweight… I love the flexibility my lightweight concentrator gives me compared to trying to carry a heavy tank of oxygen on my back. Plus, the price was the best I found on the internet. Thanks for being there for me!

Customer service is non-existent Customer service is non-existent. Phone calls are not answered and it takes days to receive an email back. I need to return this machine and they offered me $60 to keep it and sell it to someone else..then when I refused they offered me $85.00 Shipping it back cost more than $200 then they said they would charge me $109.00 restocking fee. Don't purchase from this company. I will be filing a dispute with my card company