Customer Service is excellent!
I ordered these for my father despite reviews that said they stopped working after a short time.  We were very happy with the way they worked, my father was now part of the conversation again.  However, about 2-3 weeks in one of the amplifier did in fact stop working.  It was promptly replaced after an email to the manufacturer through Amazon.  It was weeks later, that the other side stopped working in the same manner.  Thinking we were far past any help, I emailed again and it was only about 3 days later, and the second amplifier was replaced !! I can't say enough about this customer service. It was easy, and they seem to stand by their product.  I would highly recommend ordering these if a loved one needs help hearing.
Rating: 5 stars