The low-noise model that I bought, the noise is indeed very good, basically no sound can be heard, and the amount of oxygen is also sufficient. When the flow rate of 5 liters is opened, the amount of oxygen can reach 94%, which is very good!
I bought it for my dad. Because of some brain atrophy, the doctor recommended oxygen inhalation. The oxygen generator recommended by my friend. I felt suitable in size and had low noise. Highly recommended!
It took a few days to come and write the review. It's really easy to use. The operation is simple and convenient. The oxygen concentration is more than 93%. I will inhale oxygen for about 30 minutes a day. It is very comfortable and highly recommended.