Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great little fan but...

Great little fan but it died after a month! The motor stopped I tried plugging into different outlets new batteries. I contacted O-2 Cool and they said they do not have a factory warranty on it, and I was surprised because almost every product you buy comes with a warranty. So I'm out $20 something dollars. Please read the reviews before buying this fan!!