I thought this was so cool. Beth Ann and I were in the Wal-Mart in Hewitt. We needed some things from the frozen foods section. When we found the isle I looked down it and it was dark. I though maybe it was not working. As we walked down the isle looking for the items the lights in the cases came on. I have had not seen this kind of thing yet and so I was amused and entertained. Evidently they are set to stay on for longer than anyone would want to stand there and wait for them to go off. I can see where that would be real entertaining to walk up and down the isle seeing the lights go on and off. The Wal-Mart people probably saw that too.