We purchased two of these.  One works perfectly.  The other one had a malfunctioning USB port, but we over looked that...  Shortly after, the entire chair began tilting to the right and the arm looks like it's falling off.  We've had two different guys out to look at it, and apparently, it can't be fixed.  If I could give it zero stars I would.  I'm going to go back and double check to see what the warranty is.  I'd like to have a working chair for my mother.  Is that too much to ask?