Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good in the car, would like to use it in the hotel

I really liked it. It was convenient to use especially with a baby on board. But I cannot find where to buy the Ac/Dc converter so I can use it in the hotels too on long trips. It takes 2 hours to cool it down before starting out or pack the stuff with cold or frozen first. But sometimes from a hotel that is not possible on a long trip. So I would like to keep it cold through the night.