Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Never worked

About a year ago I got one of these to allow me to play DVDs for my kids on my laptop while travelling. It has an alarm that sounds when your battery is getting too low -- well it sounded immediately . I figured that my car battery was not fully charged or on its last legs. I hadn't tried to use it since. Now that I'm taking another trip, I thought I'd try it out in other cars. No luck. The thing is dead -- doesn't do a thing when I plug it in.