I had a very frustrating experience with this product.  I bought one and on the way home, I was able to use it.  It worked great!  When I got home and connected it to my computer is when all of the trouble started.

All of a sudden I could not access any of the menus.  I disconnected it from my computer,  re-started my computer, tried it all again.  Nothing worked.  I called Tech Support and an hour later, the person I spoke to suggested that I take it back to the store I bought it from and get a different one.  I did just that.

I exchanged that one for the exact same model.  In the car...