Victor
It's not medical device
It's not medical device. My son come after tga vsd surgery his heart is doing good now . The sock super hard to set up . And sometimes it's show oxigen level 98 % but heart is 50 . His lips and color very good sleep peaceful. That is no possible for heart to be 50 and oxigen 98. So much stress for parents who go already so much stress and extreme. Don't spend your money on something that is not real reading.


