Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Lasted 36 hours

I purchased this de-icer based on the mostly good reviews here on Amazon even though there were a notable number of 1-star reviews. I received the order from Amazon quickly, read the instructions and placed the heater. I noticed that after it had built up heat I could see that it was working. The area around the surface ice had melted. Good enough. The next day I went out and thought it odd that a little snow had collected on top of the de-icer and the space around the de-icer seemed to have frozen again. I left things go for several more hours and decided to pull the heater out only to discover that it was no longer working. It wasn't warm at all. So, I made return arrangements with Amazon and purchased a different de-icer.Needless to say, I was incredibly disappointed with this purchase. I had hopes that it would do a decent job but to stop working after a day and a half puts this product squarely in my junk category.