The first unit which arrived simply did not work. A representative at the company and I became pen pals of sort, writing back and forth with questions and suggestions to try. Eventually we mutually decided a replacement was needed and one was sent. Truth be told, it took a couple of months of back and forth (with my taking lots of time to try and then report thing after thing I had tried and the company taking time before replying, too). Things worked out well in the end.