Instruct: Classify Amazon reviews into positive or negative sentiment
Query: ENGINE MUST BE RUNNING TO USE THIS

I bought this for long distance travel. So I could save on Hotels...BUT ENGINE MUST BE RUNNING TO USE THIS. Thats stinks and it was a waste of my money. If you dont have heat in your car..well this blanket would be perfect for you. Useless. I wanted this for camping also...thought it would hook up to a battery of some sort. ARGHHHHH