My experience is "0". I order concentrator just in case. Condition is perfect, clean and works well. I hope it will not need my family to use it. Thanks
comes with the mask a bit smashed, but not hard to shape till it fits right. all good after shaping.
Thanks!
I am a physician, using these items in a medical practice. The staff was very professional and the product was exactly as described.
Thank you so much for your review! Stay safe!
had a problem with a unit. they shipped out a new right away
thank you for the review!