I GET NO RESPONSE FROM THESE PEOPLE, THEY HAVE MY CONCENTRATOR, DON'T RETURN MY PHONE CALLS, WHEN I GET TO THEM THEY TELL ME LIES, AND THIS HAS BEEN GOING ON FOR THREE MONTHS, I WENT TO 2818 LA CIENEGA AVE, ONLY TO FIND OUT THAT THEY MOVED FROM THAT LOCATION, AND NO BODY KNOWS WHERE. I PAID THEM $5,495.00 FOR THE FREESTYLE OXYGEN CONCENTRATOR. AND THE GUYS NAME IS HENRY, I DON'T HAVE HIS LAST NAME.